Troubleshooting
41
Condens 7000 WP – 6721842519 (2022/03)
268 O Component test activated –
269 V Flame monitoring Replace control device/burner control unit.
273 B Operation interrupted following 24 hours of
continuous operation
The fan and burner start automatically after the safety check.
281 B Pump stuck or running in air 1. Check whether the pump is blocked, unblock or replace if necessary.
2. Ensure that the heating water can circulate correctly.
3. Vent the pump.
306 V Flame signal after closing the fuel supply 1. Replace the air/gas ratio control valve.
2. Replace the ionisation cable.
3. Replace the control device/burner control unit.
316 V Flue gas temp. too high during sensor test 1. Replace flue gas temperature sensor.
2. Replace the connecting lead to the flue gas temperature sensor.
3. Replace the control device/burner control unit.
317 V Short-circuit at flue gas temp. sensor 1. Replace flue gas temperature sensor.
2. Replace the connecting lead to the flue gas temperature sensor.
3. Replace the control device/burner control unit.
318 V Flue gas temperature sensor interrupted 1. Connect the plug to the flue gas temperature sensor.
2. Check the connecting lead to the flue gas temperature sensor.
3. Replace flue gas temperature sensor.
4. Replace the control device/burner control unit.
349 B Difference between flow and return
temperature too high
1. Open the shut-off valves.
2. If the water pressure is too low, top up with water and vent the system.
3. Open a thermostat valve.
4. Replace flow or return sensor if required.
5. Replace the pump if required.
357 O Ventilation program –
358 O Anti-seizing functn. active –
360 V System fault boiler electronics / basic
controller
1. Install boiler identification module/coding plug.
2. Connect plug to boiler identification module/coding plug.
3. Replace boiler identification module/coding plug (Bosch contact customer service).
362 V Boiler identification module or boiler
electronics faulty
Replace boiler identification module/coding plug (Bosch contact customer service).
363 V System fault boiler electronics / basic
controller
Replace control device/burner control unit.
811 A Hot water heating: thermal disinfection
failed
1. If water is being drawn constantly, take action to stop this.
2. Position the DHW temperature sensor correctly.
3. Check that there is contact between the DHW cylinder temperature sensor and the
cylinder.
4. Vent the cylinder circuit.
5. Set DHW heating to "priority".
6. Check plate heat exchanger for calcification.
7. Check sizing of DHW circulation line and heat loss.
815 W Low loss header temp. sensor faulty 1. Check hydraulic configuration, correct if necessary.
2. Check sensor for breaks or short circuits, replace if necessary.
1010 O No communication via EMS BUS connection 1. Rectify wiring fault and switch the control unit off and on again.
2. Repair the BUS cable or replace it.
3. Replace faulty EMS-BUS node.
1013 W Max. combustion point reached 1. Carry out maintenance.
2. Reset service display.
1017 W System pressure too low 1. Top up water and vent the system.
2. Check the pressure sensor, replace if necessary.
1018 W Maintenance interval expired 1. Carry out maintenance.
2. Reset service display.
1019 W Incorrect pump type detected 1. Check pump cabling.
2. Check that the correct heating pump type is in the appliance, replace if necessary.
Fault
code
Fault
category
Fault text on the display, description Remedy
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