had an intermitent fault since it was new ,cant seem to get it sorted out now the fault is constant . The boiler lights ok and the fans working but it seems to keep going into flame lift but if i put it on test at maximum flame its fine, and when it comes off test it goes into flame lift again. any ideas? cheers

nath, November 2011

Disconnect the ionisation sensor, see if you get the same fault, if so most likely the PCB,not recognising the negative ions through the electrodes

Willgas, December 2020

Sounds like it could be the inlet gas pressure is incorrect, either the gas regulator on the meter is faulty of the boiler is not modulating properly so either burner pressure incorrect or pcb fault.

Steve, November 2011