C.H. Boiler not firing

[Grahamh]

Can anyone help?
Ihave a Baxi WM38/3RS boiler. The pilot light is lit but the boiler wont fire up when I switch the heating on. Any ideas would be appreciated.

 

[gazthepottertonengineer]

god thats an old boiler
could be 3 port valve is it firing up for hot water demand

 

[doitall]

Check the power is getting to the boiler from the programmer and any stats.

Have you got gravity primaries or fully pump with Motorised valves.

Most likely problem is the Thermastat if you have power to the boiler.

To test you can link out the 2 brown wire at the stat, do not leave linked as the stat will not work and the boiler will overheat

Honeywell gas valve could be gone but unlikely, have you set the pilot to burner mode.

Afterthought.

Them things had an overheat device connected to the gas valve, can't remember if they were re-setable though, again it could be link out for testing only.

 

[Grahamh]

Thanks for taking time to answer my problem. Hopefully the situation has been resolved. Apparently, when I relit the pilot light the button that delivers the gas was not fully retracted so no gas was being passed to the main burner. Anyway, everything seems to be working fine now, fingers crossed. Thanks again for your advice.

 

[viamphie]

HI GUYS

I have the exact same boiler with the exact same problem

i have replaced the programmer and the thermo coupler.

i have also bypassed the thermostat but to no avail

any help would be very very grateful

thanks

 

[viamphie]

sorted needed new main valve