Could any of the Vaillant experts help with this problem please.
Ecotec 831
Hot water change over valve replaced ( previous one leaking from spindle), also replaced the plug in water sensor.
The new valve doesn't operate, the actuator shaft doesn't appear to move whether demand is for hot water or heating.
When I go into the fault memory I find the following faults listed: F22 F73 & F75
Ecotec 831
Hot water change over valve replaced ( previous one leaking from spindle), also replaced the plug in water sensor.
The new valve doesn't operate, the actuator shaft doesn't appear to move whether demand is for hot water or heating.
When I go into the fault memory I find the following faults listed: F22 F73 & F75