Automation and malfunctions of boilers Bosch Gaz 6000 W

Automatic control for gas boilers Bosch Gaz 6000 W

The control panel of Bosch 6000 W gas convection boilers with the Cotronic 3 data bus allows you to control the heating system depending on the room temperature.

Two types of Bosch regulators are recommended for these wall-mounted convection gas boilers.

Programmable room temperature controller OpenThermTM CR12005

Rice. 7. Combination of the programmable room temperature controller OpenThermTM CR12005 with the control panel of the Bosch 6000 gas convection boiler

Purpose and functions:

OpenThermTM programmable thermostat for boiler control with Cotronic 3 data bus.

Communication with the controller via a two-wire bus.

Two-wire bus technology, reverse polarity protection.

Simple intuitive settings for temperature control and cooking control hot water.

Preset weekly programs with six switching points. Possibility to manually change the program for each day of the week.

LCD display with digital and graphic display of work status.

Display of the current heating and DHW temperature, outdoor temperature(only if there is a temperature sensor), indication of the boiler burner operation status and error codes.

Possibility of remote reset of the boiler error.

Using the OpenThermTM protocol.

The air temperature setting range in the control room is 7...39 °С with a setting step of 0.5 °С.

Room temperature controller TRZ 12-2

Fig.8. Combination of room temperature controller TRZ 12-2 (on/off) with control panel for gas convection boiler Bosch Gaz 6000 W

Description and functions of the controller

The TRZ 12-2 room temperature controller is recommended for on-off regulation of the burner flame and control of the circulation pump of gas wall-mounted boilers.

Weekly programming of time intervals.

Three operating modes: "Normal", "Economic", "Automatic".

Holiday function (up to 99 days).

Frost prevention function.

Display of date and current time, automatic change of summer/winter time (synchronization with the system).

Room temperature adjustment range from +5 to +39 °С.

Faults shown on the display of Bosch 6000 boilers

A7 - The hot water temperature sensor is defective.

Check for damage or short circuit temperature sensor and its wires, replace if necessary.

Ad - Unrecognized temperature sensor boiler.

Check boiler temperature sensor and connecting wire

C1 - Low fan speed.

Check mains voltage.

C4 - The differential pressure switch does not open when the fan is off.

Check differential pressure switch.

C6 - Differential pressure switch does not close.

Check differential pressure switch and outlet pipes flue gases.

C7 - The fan does not work.

Check the fan and its cable with plug, replace if necessary.

CE - Insufficient filling pressure of the heating system.

Add water.

d7 - Faulty gas valve wall boiler Bosch Gas 6000W.

Check connecting wire.

E2 - Faulty flow temperature sensor (open circuit).

Check for damage or short circuit in the temperature sensor and its wire, replace if necessary.

E9 - The heat exchanger temperature limiter has tripped.

Check for damage to the heat exchanger temperature limiter and its connecting wire, replace if necessary.

Check operating pressure in heating system.

Check temperature limiter, replace if necessary.

Check pump start, replace pump if necessary.

Check fuse, replace if necessary.

Remove air from Bosch 6000 W boiler.

Check the water circuit of the heat exchanger, replace if necessary.

Check the flue gas temperature limiter and its connecting wire for damage, replace if necessary.

EA - No flame detected.

Check the protective conductor connection.

Check if it's open gas cock.

Check gas supply pressure, correct if necessary.

Check the electrical connection.

Check electrodes with wires, replace if necessary.

Check the flue gas system, clean or repair if necessary.

Check gas setting, correct if necessary.

For natural gas: check gas flow switch, replace if necessary.

When working with combustion air intake from a room, check the air supply to the room and the ventilation openings.

Clean the heat exchanger.

Check gas fittings, replace if necessary.

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2017-04-29 Evgeny Fomenko

The device and principle of operation of Bosch boilers

The most popular models among the Bosch boiler line are double-circuit ones. They have two tasks: the first is heating the room to a predetermined temperature, the second is providing hot water for household needs.

Bosch devices, namely the Bosch Gas 4000 W and Junkers Bosch models, are equipped with two independent heat exchangers, which allows them to perfectly perform two tasks: heating water and providing heat in the room.

In each of the models, it is possible to choose the power of the device that suits you from 12 to 35 kW, when choosing, the area of ​​\u200b\u200bthe room is taken into account. As for heating the liquid for household needs, the performance is about 8-13 liters per minute.

Advantages of the wall double-circuit boiler:

Flaws:

• The first 20-40 seconds after you turn on the hot water faucet, cold water flows.

Let's take a closer look at how the device works, using the Bosch Gas 4000 W ZWA 24 model as an example. When the boiler is operating in heating mode, using gas burner heat is transferred to the primary heat exchanger, which is a structure made of copper tubes and plates.

So that they do not deteriorate from exposure high temperatures and water, their surface is covered protective layer. Its main task is to transfer the heat generated during the combustion of the flame to the heating system. The movement of water in the system is provided by the pump.

Also, the design provides a three-way valve, its task is to prevent water from entering the secondary heat exchanger. The secondary heat exchanger is necessary for domestic water heating. The heated liquid for the heating circuit leaves the device through the heating supply line, and the cooled liquid enters through the heating return line.

When the boiler is set to heat water for consumption, the 3-way valve closes heating circuit. The heated liquid flows from the primary heat exchanger to the secondary one, and then flows out of the device.

Bosch boiler three-way valve

The advantage when using different heat exchangers is obvious. Often used for heating plain water, and it usually contains impurities. When it is heated, impurities begin to form deposits that adversely affect the heat exchanger, reduce it throughput, prevent heating of water, reduce its service life.

And when the liquid that flows through the primary heat exchanger is in a closed circuit, it does not change its chemical properties minimizing negative consequences.

The fluid that flows through the secondary heat exchanger will form deposits over time, and over time, the heat exchanger will need to be replaced or cleaned. If a malfunction occurs on winter period, your boiler will be able to operate uninterruptedly in heating mode using the primary radiator.

Basic error codes

Like any device, the Bosch gas boiler also sometimes fails and needs to be repaired, let's take a closer look at its possible malfunctions and how to fix them.

11

Error 11 is possible in the Bosch BWC 42 device, stands for, in the same way as error E9, signals the operation of the flue gas temperature limiter.

Flue gas temperature limiter

You need to do the following:

• check for wire damage flue gas temperature limiter, if a rupture or melting is found, replace;
• check pressure in the device;
• check temperature limiter;
• check pump health when it starts;
• if air has accumulated in the boiler, bleed it.

23

Error 23 is not an error, this code appears during settings and indicates the type of natural gas used

50

Error 50 appears on Bosch ZWA 24 models when there is no flame.

Boiler Bosch ZWA 24

How to fix it:

70

Error 70 means a malfunction of the differential relay during ignition.

Causes and ways to eliminate it:

• differential relay malfunction, can be determined by measuring its resistance, if it does not correspond to the nominal, the relay will be replaced;
• mechanical contact failure and wires suitable for the relay, check and connect the wires;
• bad chimney, it can become clogged, clean the chimney;
• incorrect setting or failure of the fan, adjust the fan operation, if it is faulty, replace it.

a2

Error a2 appears when the exhaust gases exit the combustion chamber, it indicates the clogging of the heat exchanger with soot and burning. To eliminate clean the heat exchanger.

Cleaning the heat exchanger with compressed air

e2

Error e2 - the temperature sensor on the supply line is faulty. Ring the sensor for a short circuit or open circuit, inspect the connecting wires for a broken circuit or oxidation. Strip or connect the wires, in case of sensor malfunction, replace with a new one.

e9

Error e9 means the temperature limiter has tripped.

The causes of occurrence and methods of elimination can be the following:

ea

Error ea indicates the absence of a flame in the on state.

When this code appears, check:

er

Error er (ep) appears in case of incorrect operation of the boiler when a malfunction occurs in any of the units of the device.

c3

Error c3 appears on the Bosch ZWE boiler if exhaust gases appear on the combustion chamber. You can fix this problem by cleaning the heat exchanger in accordance with the instructions in the instructions.

с4

When the differential pressure switch is closed with the fan turned off, error c4 appears.

Differential relay

When this code appears, you can do the following:

• blow out the tubes coming from the relay, having previously removed the relay, which is located at the top of the boiler. If the relay clicks, the problem is fixed;
• measure the resistance with a multimeter for an open or short circuit, with inappropriate parameters, the relay must be changed.

с6

Error c6 means that the differential relay does not turn on when the fan is turned on.

What to do when this code appears:

• check the chimney, remove interference, coaxial chimneys sometimes it can be ice or frost.
• check for condensation on the pipes coming from the relay. Dry the tubes with a hair dryer.
• check relay for short circuit or open, replace the relay if necessary.

ce

Error ce is a fairly frequently repeated code in Bosch gas boilers (bosch gaz) 6000 24 kW and means insufficient pressure in the heating circuit.

Boiler Bosch gas 6000 24 kW

The lack of water in the circuit is determined by the pressure gauge:

• if pressure gauge is in the red zone, it is necessary to add water to the system using the make-up tap, which is located under the device;
• if the pressure gauge is in the green zone, the pressure sensor should be changed. The microswitch or membrane in the sensor may be defective.

f0

Error f0 means an internal fault. When it appears, you need to check the reliability of the connection of the terminals and wires to the electronic board. If the wires are not oxidized, the connections are not broken, then this is a malfunction of the board itself, it should be replaced.

fd

The fd error appears if the button has been pressed for more than 30 seconds. To reset this code, press and hold the button for less than this time.

se

Error se gives a signal about insufficient filling of the heating system.

Heat exchanger with scale and after cleaning

What should be done:

• add water:
• the reason why the pressure drops may be a leak or depressurization of the heating pipes. If the pipes are hot, it is difficult to detect a malfunction, as water may evaporate at the leak. To determine, it is necessary to cool the system, seal the joints in the places of leakage:
• the heat exchanger may be clogged with scale, remove and rinse it, the procedure is described in the instructions for the boiler.

Other malfunctions

Above are the most frequent codes errors, let's look at other possible malfunctions.

Sometimes there are such problems:

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Boiler Bosch - Errors and their meaning

Bosch WBN 6000 boiler error codes

A7- Malfunction of the DHW temperature sensor. Inspect the sensor for a defect or short circuit and its wiring. Replace if necessary.

Ad- The unit cannot detect the boiler temperature sensor. It is required to inspect the boiler temperature sensor and connecting wires.

C1- The fan rotates at a low frequency. You need to check the mains voltage. Also inspect the flue gas system and, if necessary, clean or repair it.

C4- No opening of the differential pressure switch if the fan is off. The diff needs to be checked. pressure switch.

C6- The differential pressure switch does not close. Check the fan and wires with plugs. Perform replacement if required. Check diff. pressure switch and pipes for the output of combustion products.

C7- The fan does not work. Check the fan and its wires with plugs. Perform replacement if required.

CE- Not enough pressure in the heating system. Water needs to be filled.

d7- Fault gas system. Check the connecting wire. Inspect the gas system and replace if necessary.

E2- Malfunction of the temperature sensor on the supply line (break). Needs to be checked for possible damage or short circuit of the sensor and its wiring. Replace if necessary.

E9- The temperature limiter is activated in the heat exchanger. It is necessary to check for possible damage to the temperature limiter of the heat exchanger and its connecting wires. Perform replacement if necessary. Verify nominal pressure in system. Inspect the temperature limiter and replace with a new one if necessary. Run a startup check circulation pump and, if necessary, replace it. Check fuses, change if necessary. Remove air from the unit. Check the water circuit in the heat exchanger. If necessary, replace. Check the flue gas temperature limiter for possible damage.

EA- No flames. Check connection of protection wires. See if the gas valve is open. Test the gas supply pressure reading and correct if necessary. Check connection to electrical network, electrodes with wires and, if required, replace. Inspect output system combustion products, clean or repair. Check gas adjustment
eliminate if needed. For natural gas: Inspect the switch controlling the gas flow. Change if necessary. When working with combustion air intake from the room, check the air supply to the room and the ventilation openings. Clean the heat exchanger. Check gas system, replace if required.

F7- When switched off, the boiler detects a flame. Check electrodes for oxidation, replace if necessary. Inspect the flue gas system and clean or repair if necessary. Check for moisture in the electronic control board, dry if necessary.

FA- Defined a flame when the gas supply is turned off. Check the gas system, replace if necessary. Inspect electrodes and connecting wires, replace if necessary. Inspect flue system, clean or repair.

P- The boiler type is not defined. Set the implement type.

fd

Bosch ZWC MFA boiler error codes

A2, C3- Flue gas outlet at the combustion chamber. Check the heat exchanger for clogging.

A3- Flue gas temperature sensor not defined. It is required to check the sensor and connecting cables for damage.

A4- Flue gas outlet at flow fuse. Carry out a flue gas outlet test.

A6- The temperature sensor in the combustion chamber is not defined. It is required to check the sensor and connecting cables for damage.

A7- Malfunction of the temperature sensor for hot water supply (DHW). Check for defects or short circuits in the temperature sensor and its wiring, if necessary, replace.

A8- Contact with the BUS bus has been interrupted. Check contact cable and regulators.

A9- Incorrect installation of the DHW sensor. Check the mounting distances, if necessary, remove the sensor and mount it again using heat-conducting paste.

AC- The module is not defined. The module is not connected correctly. Check the module, outside temperature sensor, remote control and contacts.

Ad- The unit cannot detect the boiler temperature sensor. It is required to inspect the boiler temperature sensor and wire contacts.

b1- Coding plug not defined. Spend correct installation coding plug, measure and replace if required.

C1, C6- The differential pressure switch does not close. Check the fan and wires with plugs. Perform replacement if required. Check diff. pressure switch and pipes for the output of combustion products.

C4- Diff. the pressure switch does not open in the off position. Perform differential pressure switch test.

CC- The control unit cannot detect the outside temperature sensor. Need to inspect the sensor and contact cable for breakage.

d3- Jumper 161 not found on ST8. If there is a jumper, insert the plug correctly, check the external limiter. Otherwise: check if there is a jumper.

d4- There is a large temperature difference. Check circulation pump, bypass hose and system pressure.

d5- The external temperature sensor is damaged. Check sensor and connecting contacts.

E2- Flow temperature sensor defective. Check sensor and connecting contacts.

E9- A limiter has tripped in the supply line. Perform a pressure test in the system, temperature sensors. Check the functions of the pumps and the fuse on the control board, bleed the air from the unit.

EA- No flame detected. Check the gas valve. Check the pressure in the gas network, the mains connection, the ignition electrode with wire and the ionization electrode with cable.

F0- Internal malfunction. Check the correct connection of the electrical plug contacts and starter lines, if necessary, replace the electronic board.

F7- The flame is detected when the unit is off. Check the electrodes and cables. The flue gas removal system may be defective. Check control board for moisture.

FA- Flame detection after turning off the gas supply. Check the ionization electrode. Check gas system.

fd- Incorrect button pressing (duration more than 30 seconds). Press the button again less than 30 seconds.

Faults and adjustments of Bosch boilers

Wall boiler Wbn 6000-24. Gas is natural. It's been a long time since the EA bug. After reading about the EA error, I decided to find out the firmware of the board and the fan stage settings. If the software version in the menu displays "245-03" and, as it were, raises no questions, then the fan steps menu showed the number "17". The flue system is horizontal with a concentric pipe. The exit from the boiler is about 2 meters. I have not installed any adapter for air intake from inside the room and the air enters the unit from outside the room. What guided the masters by installing the 17th stage of the fan, although, judging by the instructions, the 2nd stage is needed. Do I need to change the board?

An adapter is not needed. You have a standard coax with air intake from the outside. It helps to get rid of this error by setting the fan stage to 5. I had the same thing, and when I set it to 5, there was no error for a year already.

Recently flushed heat exchangers gas boiler Bosch 6000. It worked for a month and kept the pressure at 1 all the time. Then it attracted a strange murmuring sound inside it before the burner was ignited (in the cooling mode), as if water was being poured from one mug into another. I looked, and the pressure was 0. In theory, it should have automatically turned off when the pressure in the system dropped to 0.5, but it worked and warmed the batteries. The only thing that appeared was a different sound and murmur. I added the pressure to 1, but the next day the pressure dropped back to 0.5 (meaning there is a water leak somewhere). I checked the pipes and radiators, but found no leaks anywhere. It does not drip from the unit either, but the pressure still drops. Tell me what could be
problem and where to find it?

I had a similar one. In the system, the air and after the operation of the device, the air came out, and the pressure dropped. Is your automatic air vent valve (on top of the pump) not closed? It needs to be always open. It is better to bring the pressure up to 2 atm. expansion tank in the boiler, too, took the volume and compensated for the outgoing air. In radiators, of course, also bleed air with a Mayevsky crane.

The Bosch 6000 24 kW gas wall-mounted boiler often gives an EA error and often turns on and off. That is, conditionally - I set it to a minimum of 40 degrees, literally 5 minutes and turned off, etc. I used to warm it up as it should, but now the first batteries are hot, the distant ones are barely warm, it doesn’t reach them. Works on return temperature, room thermostat no.

The EA error can be resolved by setting the fan stage to 5. If the unit turns off quickly, it means that its minimum power is too high for your system. It cannot give less than 8 kW. And you apparently have 5 radiators in the system. Here he heats this water and turns off. And why does it heat them up so quickly, the following malfunctions are possible: something is clogged or airy, or the first radiators need to be balanced so that the entire flow does not go only through them. Here it is necessary to look at the scheme of radiators and so on. Try setting the pump speed to maximum (value 3) and bleed the radiators.

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This article contains all possible malfunctions and options for their elimination, as well as error codes for Bosch boilers. All information is read in next order: code - name - possible malfunction. If you have any additional questions, please leave them in the comments to this article.

If you are not 100% sure what exactly the problem is and that you can solve it, immediately contact service center for troubleshooting and troubleshooting.

You can find out the price and buy heating equipment and related products from us. Write, call and come to one of the stores in your city. Delivery across all territory of the Russian Federation and the CIS countries.

Bosch Gaz 6000 boiler errors

The list below shows malfunctions specifically for Bosch Gaz 6000 series boilers. Determine the error code and troubleshoot in a timely manner.

Error code A7 - Hot water temperature sensor has a malfunction

Error code Ad - Boiler temperature sensor not defined

Check boiler sensor and connection wires.

Error code C1 - The fan rotates at a low frequency

1. Check mains voltage.
2. Check flue gas outlet. If necessary, clean or repair.

Error code C4 - The differential pressure switch does not open when the fan is not running

Check diff. pressure switch.

Error code C6 - The differential pressure switch does not close

1. Check diff. pressure switch, as well as flue gas pipes.

Error code C7 - Fan does not work

Check fan, cable and plug. If required, replace.

Error code CE - Low pressure to fill the heating system

Perform water refill.

Error code d7 - There is a malfunction of the gas fittings of the Bosch 6000 wall-mounted boiler

1. Check the connection wire.

Error code E2 - Malfunction or breakage of the temperature sensor on the supply line

Check the sensor for a defect, as well as a possible short circuit in its wire. Replace if required.

Error code E9 - Operation of the heat exchanger temperature limiter

1. Check the temperature limiter of the heat exchanger for a defect, as well as a possible short circuit in its wire. Replace if required.
2. Check the operating pressure in the heating system.
3. Check the temperature limiter, if necessary, replace it.
4. Check pump start. If required, replace the pump.
5. Check fuse, replace if necessary.
6. Remove air from the Bosch 6000 gas boiler.
7. Check the water circuit of the heat exchanger, replace if damaged.
8. Check the flue gas temperature limiter for a defect and a possible short circuit in its wire. Replace if required.

EA Error Code - Flame Not Found

1. Check the connection of the protection wire.
2. Check the opening of the gas cock.
3. Check gas supply pressure. Troubleshoot if required.
4. Check the electrical connection.
5. Check electrodes and wires. Troubleshoot if required.
6. Check the flue gas outlet. If necessary, clean or repair.
7. Perform gas adjustment. Troubleshoot if required.
8. For natural gas: check the gas flow control switch. Troubleshoot if required.
9. When using a combustion air intake from a room, check the air draft into the room and the ventilation openings.
10. Clean the heat exchanger.
11. Inspect gas fittings. If required, replace.

Error code F7 - Flame detection when the boiler is off

Although the boiler is switched off, a flame is detected.

1. Check the contamination of the electrodes, replace if necessary.
2. Check the moisture content of the electronic board, dry if necessary.

Error code FA - Flame detection after turning off the gas supply

After turning off the gas supply, a flame was detected.

1. Check gas fittings, replace if necessary.
2. Check electrodes and connecting wires, replace if necessary.
3. Check the flue gas system, clean or repair if necessary.

Error code P - Boiler type not defined

Set boiler type.

Error code Fd - The button was mistakenly pressed for too long (more than 30 seconds)

Error codes for gas boilers Bosch ZSC / ZWC 24 MFA

Below is a list of faults specifically for Bosch boilers of the ZSC / ZWC 24 MFA series. Determine the error code and troubleshoot in a timely manner.

Error code A7 - Hot water temperature sensor is defective

Check for damage or short circuit in the temperature sensor and its wires, replace if necessary.

Error code A8 - BUS connection interrupted

Check connecting cable and regulators.

Error code A9 - Hot water temperature sensor incorrectly installed

Check the installation area, if necessary, dismantle the sensor and reinstall it using heat-conducting paste.

Error code Ad - Boiler sensor not detected

Check boiler sensor and connecting cable.

Error code b1 - Coding plug not found

Insert the coding plug correctly, measure it and replace if necessary.

Error code C1 - The differential pressure switch has opened during operation of the device

Check differential pressure switch, exhaust device and connecting pipes.

Error code C4 - Differential pressure switch does not open in non-operating position

Check differential pressure switch.

Error code C6 - Differential pressure switch does not close

Check differential pressure switch and flue pipes.

Error code d3 - No jumper found on ST8 161

If there is a jumper, insert the plug correctly, check the external limiter. Otherwise: is there a jumper?

Error code d4 - Temperature difference too high

Check pump, bypass hose and system pressure.

Error code E2 - Flow temperature sensor not working

Check temperature sensor and connecting cable.

Error code E9 - The restrictor in the flow line has tripped

Check the pressure in the system, check the temperature sensors, check the operation of the pumps and the fuse on the electronic board, remove air from the device.

EA error code - Bosch ZSC / ZWC boiler does not detect a flame

Is the gas cock open? Check the pressure in gas network, mains connection, trigger electrode with cable and ionization electrode with cable.

Error Code F0 - Internal Fault

Check the tightness of the connection of electrical plug contacts and jumper lines, if necessary, replace the electronic board.

Error code F7 - Although the boiler is turned off, a flame is detected

Check electrodes and cable. If flue gas extraction is working, check the electronic board for moisture.

Error code FA - Flame detected after gas supply cut off

Check ionization electrode. Check gas fittings.

Error code Fd - The button was mistakenly pressed for too long (more than 30 seconds)

Press the button again less than 30 seconds.

Error code CC - Outside temperature sensor not detected

Check the outside temperature sensor and connecting cable for damage.

Problem: “Error EA appears on the new BOSCH WBN 6000-24c boiler - no flame was detected. The more degrees set, the less often the error. But at low temperatures it gives an error almost every day. The flame icon disappears before the error occurs. What to do?"

• Check if the protective conductor is connected;
• Make sure the gas valve is open;
• Check gas pressure, correct if necessary;
• Make sure that the electrical connection is correct;
• Check electrodes with wires, replace if necessary;
• Check the flue gas outlet system, clean or repair if necessary;
• Check gas regulation, correct if necessary;
• For natural gas: check the gas flow control switch. Replace if necessary;
• When working with combustion air intake from the room, check the air supply to the room and the ventilation openings;
• Clean the heat exchanger;
• Check gas fittings, replace if necessary.

In 90% of cases, the problem is in the board. The best thing is to immediately contact the service center. They will be able to provide quality assistance: make diagnostics and repair the boiler.

I hope the article Gas boiler WBN BOSCH 6000-24c error EA' was helpful to you.