Baxi 105e, no hot water or central heating.

[Andrew50]

I have a Baxi 105e Combi boiler, no hot water. No central heating either but that's not important right now.

Two faults displayed, Flame Failure and Fault on Fan or Flue.

I've been going through the DHW Fault diagnosis, can you tell me if I've missed anything please?

System pressure is okay at 1 bar

When opening the hot tap, DHW flow switch is activated.

Air pressure sensor at the main board is normally closed (as expected)

DHW temperature sensor is within normal range.

Safety overheat thermostat is normal - less then 1.5 ohms.

At the main board there is no mains voltage for the Pump or the Fan.

I'm thinking that the main board is faulty, I've checked the two identical relays on the main board by removing them to test and they're working as they should.

Thanks very much

 

[gas112]

two lights on a 105 is usually 99% board fault

 

[Andrew50]

two lights on a 105 is usually 99% board fault

Thanks, after checking everything I could think of I found one of the pins on the multiplug that connects to the reset switch which looked a little suspect, it was inserted all of the way into the plug but the tabs that hold it in place made it look as if it hadn't been inserted correctly, after fixing that the reset switch worked which it mustn't have before and the fault codes have gone and it's working fine now.