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ok the APS is open circuit with the boiler at rest but demand on. I'll try temporarly bypassing it and see if that cures the problem. The 2 guys i used both clamed to be familular with these boilers etc but the first one blew the main fuse on the board and the 2ndd one wanted to randomly...

I know the fan is ok i have tested it separately. I meant i couldnt access the wiring in situ to check the supply but took it off to check the fan itself. I understand the bit about getting someone to look at it but I am not a complete novice and to be honest dont want to pay the £300 that...

Hi. I ahve a ferroli domina 80 combi that wont fire up in either CH or HW mode. The demand lights come on but the boiler refuses to fire. I have checked the manual and followed the diagnostics in it. There is 230volts being passed from the main pcb to the igintion pcb. The low water pressure...