I had the dreaded PCB lockout issue a couple of years back, and had the PCB replaced. Bolier now works perfectly, except on two occasions recently the boiler seems to have reverted to a flashing amber light, does not come on, then eventually (after an hour or so) comes on and is working fine again. Is this normal? I have been caning it a bit recently what with the cold weather, do these things sometimes generally need a "rest/cool-down" period? Or is this an indication that this problem could get worse?

Quicklyman, January 2013

Replace the thermistor (top left) its in a dry pocket so no need to drain system.

Dave, January 2013

I should add, that when I had the original PCB replaced, it was with the new version which I understand is supposed to be very reliable.

quicklyman, January 2013

Very common problem poor design of PCB you have to replace it or get recondition one from negi house alperton lane wembley two rely switch at faulty

ltd, January 2013