Vaillant 828E - no hot water?
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Vaillant ecotec plus 630?
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can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vailliant turbo max plus 824e?
No hot water, intermittent when air temp drops?
Vaillant Thermocompact Fault?
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Boiler over pressure on the hot-water side?