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Hi, When I had the original problem I eventually called a heating engineer out, they then called out a British Gas engineer. They swapped the Fan and PCB but it still caused the F3 error. they then traced all the wiring and it turned out to be a wiring fault from the pcb to the Fan I think...

Hi, This happened to me, It was the divertor valve actuator that caused the problem, it is a black unit that attaches to your divertor valve. I got one on Ebay for £20 and got the engineer to fit it. Watched him doing it and it took ten minutes, was very easy. there is no interference with...

HI, Thanks for all the replies, according to the manual there is no F3 fault it jumps from F1 to F4. I called the Glowworm consumer technline (at 50p per minute) and spoke to a techy, they said the F3 is more than likely related to the PCB or Fan, just like the engineer did, I told him they...

Hi Folks, Looking for some help, I have a glowworm 30 CXi boiler, couple of nights ago the boiler switched off and displayed an F3 error and hasn't come back on since. Heating engineer has been out and replaced the fan and then today the PCB. It's still not working, same error. The fan...