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Valiant boiler- in summer mode but radiators heat up
Hi, I have set the boiler control to Summer Mode, but sometimes the radiators are heating up. Also set the temperature to zero on the boiler. Does anyone have any advice please?
2 Answers from MyBuilder Plumbers
Common problem in Vaillants. Internal diverter valve not closing properly, especially when hot water plate heat exchanger is partially clogged up. In worst case need both replaced. Around £200 in parts.
Answered 3rd Aug 2021
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