vaillant ecoTEC plus boiler fault code - how to fix?
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how do I rectify the fault as detailed below?
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no heating water?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
No hot water, intermittent when air temp drops?
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Vaillant ecotec plus 630?
Hot water comes and goes!?
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What does f.25 mean?