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Troubleshooting
41
Condens 7000 WP – 6721841195 (2022/01)
349 BDifference 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 OAnti-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 VBoiler 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 AHot 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.
1022 W Cylinder temp. sensor faulty or contact
problems
1. Connect the plug to the temperature sensor correctly.
2. Connect the plug to the control device correctly.
3. Check the temperature sensor, replace if necessary.
4. Check temperature sensor connecting lead, replace if necessary.
1023 Maximum run time including standby time
reached
1. Carry out maintenance.
2. Reset service display.
1025 W Return temp. sensor is faulty 1. Connect the plug to the return temperature sensor correctly.
2. Replace return temperature sensor.
3. Replace connecting lead to return temperature sensor.
4. Replace control device.
1037 W Outside temp. sensor faulty - heating back-
up operation active
1. If an outside temperature sensor is not desired. Select the room temperature-
dependent configuration in the control device.
2. If there is no continuity, rectify the fault.
3. Clean corroded terminals in the outside sensor housing.
4. If values do not match, replace the sensor.
5. If the sensor values matched, but the voltage values do not match, replace the control
unit.
1065 W System pressure sensor faulty or not
connected
1. Connect the plug to the pressure sensor correctly.
2. Check pressure sensor connecting lead, replace if necessary.
3. Check the pressure sensor, replace if necessary.
Fault
code
Fault
category
Fault text on the display, description Remedy
41


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