I thought the thermostat was duff as the boiler would only start up on the reset switch, the rads get warm but not hot and the hot water is only warm. There are 4 led's on the board, when I turn on the power numbers 1, 3 and 4 stay lit, number two stays off, should all 4 come on at power on? Some time ago the thermistors packed in and the led's registered this in there flashing sequence, does number 2 staying off mean there is a fault somewhere in the system?
Thanking you in advance.
Alan R
Thanking you in advance.
Alan R
