Yessum :) a faulty safety device. The boiler has been left switched off after testing. I've just nipped out and paid £20 for a new sensor (grr wish Amazon had it on Prime).. fitting will commence imminently.
Cheers!
Actually, I've rechecked what sensors cause the fan to spin up constantly. It's actually just the overtemp stat. Unplugging the others just stop the fan relay trying to click in.
I'm wondering if it's actually the stat that's got a weird intermittent fault where by, at rest it's got continuity...
Please, I know these boilers get a load of stick but I'm stuck with one and could really do with some help!
I woke this morning to find my boiler ignition failure light blinking. Turning the power off and on didn't fix it and the pressure in the system is fine at 1 bar.
The boiler currently...