F.072
The temperature spread between the flow and return temperature sensor is invalid.
Vaillant ecoTEC Plus Combi
Possible cause
Flow temperature sensor defective
Measure
Check and, if required, replace the flow temperature sensor.
Possible cause
Fault in the electrical connection for the flow temperature sensor
Measure
Check and, if required, replace the wiring harness between the PCB and sensor, including all plug connections.
Possible cause
Return temperature sensor defective
Measure
Check and, if required, replace the return temperature sensor.
Possible cause
Fault in the electrical connection for the return temperature sensor
Measure
Check and, if required, replace the wiring harness between the PCB and sensor, including all plug connections.