how do I rectify the fault as detailed below?
Vaillant Ecotech Plus 831 F22 fault?
my boiler will no work?
Valliant Eco tec 28?
Vaillant ecomax 828/2 e water pressure sensor?
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Vaillant eco plus 531 boiler?
my vaillant boiler is saying a code com on it ?
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Valiant thermostat , BMU-Err ?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
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