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Vaillant Thermocompact Fault?

My 10 y.old Thermocompact 624e is refusing to start. I keep getting code F 1 on display, then it tries to start and then F 1 again, sometimes I get F24. On very odd occasions it has managed to start but not for long. My plumber has replaced the pump but is now stumped.

April 2016
This may help:

F1 = NTC Fault
F24 = Pump not running/blockage (Not necessarily in the pump, remember!)

April 2016

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