F.078
The control centre is not supported by the unit.
Vaillant ecoTEC Plus Combi
Possible cause
Incorrect control module connected
Measure
Check whether the control module is compatible with the product.
Possible cause
Fault in the electrical connection for the domestic hot water connection temperature sensor
Measure
1. For products without integrated domestic hot water generation: Check whether the bridge on plug X2 between contacts 2 and 5 is plugged in and is without interruption.
2. If the bridge is working correctly, check and, if necessary, replace the wiring harness between the PCB and sensor.
This code also applies to: