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potterton prima F not firing up?

It sounds amazing but, the boiler comes on in the morning cycle
but dose not fire up for the evening cycle. It will not come on even when I
click the extra hour button, what can it be?

Peter Hodson
December 2016
If the boiler fires up then there's very probably nothing wrong with the boiler - perhaps you should be suspicious of the timer programmer.

What happens if you select it to be permanently on and just use the room thermostat as a method of control - turn it down when you retire for the night and up again in the morning - same when people leave in the morning and return in the evening.

Good Luck...
December 2016

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