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The engineer has just been round and upped the bar abit. He seems to think that it could be the thermistor to the central heating/hot water side. Can you let me know please if that sounds about right?

Thanks Dave - how do i pressurise the boiler pls?

Fault 4 indicates a flame ingnition fault. The pressure reads 0.5 when doing nothing and goes up to just below the 1 when I run the hot tap.

Re. Potterton Performa 28 The hot water works okay but when its time for the central heating to kick it, it fails along with the water. Basically, the flame will not ignite and the light just keeps flashing (fault 4 in the manual). Ive tried resetting it but to no avail. I have now...