Glow worm ultimate 60ff?

[solutions]

Fan pulses on ignition but doesnt start sparking just keeps pulsing the fan. Im thinking air pressure switch or board. Odd thing is its intermittent and I couldnt get it to do it often enough to carry out enough tests with multimeter to confirm either way. Anyone had this before or can offer any advice?

 

[Roger Welton]

Had this before was the board, fan starts - makes pressure switch - power cut from fan - aps breaks - repeat

 

[gassafe]

Yeah I had this on similar boilers, the aps activates a relay & then killed power to fan etc... Just cycles fan on & off, always makes it look like a dodgy fan but is board I reckon!

 

[Ermintrude]

Check supply to boiler, and demand? If they are irratic can look like board but it's power.

 

[mfgs]

I had this problem on an ultimate before, or maybe it was a micron. It was the pcb at fault.

 

[stevetheplumber]

nearly always a board profiles did this as well

 

[arran197]

Yep, had the same. PCB.

 

[solutions]

Thanks everyone. Board change it is then.

 

[bright spark]

I had this with a potterton prima this morning fan starting ant stopping never quite getting to full speed. As said above just check the power to fan, and the perm and switch live voltage before ye collect the pcb