BAXI 105E PROBLEM

[AFOOTYFAN]

Please help ? I have just replaced a pcb on a baxi boiler 105e as this is where the fault tree pointed. The problem is the CH does not work, the DHW works. The CH is calling for heat, after replacing the pcb at £85-00 the CH burner comes on for about 10 seconds and then extinguishes (this hapened before). At no time do any of the neons flash they remain illuminated. This indicates everything is OK
Before I go out and spend some more money, does anyone have any ideas (flame sensing device-safety thermostat-diverter-diapragm- ??? thanks.

 

[paulybaby]

suggest get a corgi man to check max/ min/ch/ burner pressures

 

[AFOOTYFAN]

suggest get a corgi man to check max/ min/ch/ burner pressures

thanks, the CH comes on briefly but goes off, only one radiator heats up..!!

 

[diverdee]

do the red leds climb to the top of there range when u switch heating on ? if so it may just be the thermistor resistance is reading wrong .if so just change this is very quick and cheap to change.and sounds most likely culprit

 

[AFOOTYFAN]

It was the diverter valve that was faulty, as soon as it was replaced boiler worked OK. Corgi man did it. Thx anyway