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                how do I rectify the fault as detailed below?
 
                Vaillant ecotec 831 plus?
 
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                Boiler over pressure on the hot-water side?
 
                Advice?
 
                my vaillant boiler is saying a code com on it ?
 
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                Hot water comes and goes!?
 
                can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
 
                Vaillant Ecotech Plus 831 F22 fault?
 
                No hot water, intermittent when air temp drops?
 
                how do I vent the heat exchanger?
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