my vaillant boiler is saying a code com on it ?
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Hot water comes and goes!?
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Valiant thermostat , BMU-Err ?
Vaillant Thermocompact Fault?
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can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Why is heating on at night?
Valliant Eco tec 28?
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Problem with the pressure in combi boiler?