hi guys hope you can help i have a baxi instant 105e i have a fault that has come on saying that the fan or flue fail cant get any hot water or ch anyone got any ideas please help neal

neal, November 2009

i never said it did
read the manual before opening your mouth
ste

b, November 2009

just cos theres no power to fan does not determine failed pcb tho on a baxi, it checks air pressure switch is open first then sends power to fan then checks air pressure switch is closed. had it a few times when switch sticks shut and boiler just cycles pump and no power to fan.

ste, November 2009

can you hear the fan running first. if not you will have to
take the front off the boiler and check the fan turns and check for voltage to
the fan. if there is no volts then it may be the harness
or pcb.PCB - A2 connector 230V across terminals 5 & 7

the air pressure switch is just behind the fan with pipes going to it
1. Electrical and pressure tube connections
2. Blockage of pressure tubes
3. Restriction in flue
4. Venturi
turn power to boiler off first

b, November 2009

hi b can you tell me how to check these thanks neal

neal, November 2009

check fan and air pressure switch

b, November 2009