Thermostat works on "Advance" but not when on time

JoJo777 · 6 Feb 2012

I have a Potterton 40EL-80EL boiler, it is 10 years old. Suddenly our thermostat only controls the heating when I have it on the advance setting, otherwise when the heating comes on with the timer it is on full blast even when I turn the thermostat to its lowest setting the radiators do not cool down. Any ideas as to why it works on one setting and not the other? Thanks in advance.

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Thermostat works on "Advance" but not when on time

JoJo777

DIYnot Local

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