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No heating but hot water is OK

Posted by Faye Barclay, on
Hi, I have a Vaillant ecotec pro 24 combi boiler. Hot water is working fine, but when I try to switch on the boiler via the thermostat fitted next to it, it flicks off straight away. The thermostat is Honeywell. Can I fix myself or do I need an engineer? Thanks

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