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PCB was the problem, boiler running well touch wood!

Tried hot wire, fan powers up fine, put I think because it doesn't do the checks in the correct order or fault still on PCB boiler doesn't fire up. The actuating rod to CH microswitch goes in and out all the time. I tried giving 240v to the fan after turn on but this didn't work fault kicks...

Had another look at PCB, as microswitches were making, took board out to check under the baord. Found that The wires in the connector weren't making with the connector on the board! Had multimeter over it to check continuity and boiler started to fire than original faul. Sorted connections now...

I think the 2 microswitches (if DHW and CH on at same time) are making, and have conectivity (buzzed out) ok. I will check again tonight, when I'm back from work.

No worries Ray, thanks for the reply. I thought so too before engineer came out! Both pins on DHW and CH pop out and make with microswitches (green lights on the front)/, Fault still there, quite strange, as I thought this would be the problem.

Plot thickens. Engineer came back, replaced air pressure switch and same fault. Said it was PCB and would be £230 +VAT to replace. So I said we would have to think about it. Decided to look at the PCB myself, looked at connector A5 7 & 8 and wires were loose, so fiddled with them and...

We have had an engineer out it. Unbeleiveable my little boy must have been playing with the thermostat that's why no demand! Typically silly mistake! However, It all worked for a bit and then same fault lights. This time pump is on, still no fan. Engineer didn't know what is wrong so he...

Thank you for the advice. It was strange that I tried it from cold and I held in the Hot Water microswitch and it fired up, I then let it go and it stopped again. No it stays quiet no noise from fan pump etc.

Hi all, Please can you help me. I have a Baxi 105e boiler 4.5 years old. Its just stopped working. When it is turned on the Flame Failure and Fault on Flue or Fan lights up. No sounds come out of the boiler. The fan motor is slightly corroded. Do you think its the Fan? The hot water...