Burner not starting when system calls for heat - OIL COMBI

[ChipperFred]

Grant Oil COMBI Max Outdoor.

Burner not starting recently for either heating or hot water.

Burner wont start AND Burner light does NOT come on on the control panel when the system should be "calling" for heat either from heating or hot water. Central heating Pump will start circulating ok for heating but burner stays dead.

Sometimes switching all power off to the boiler i.e restarting the whole boiler temporarily solves the problem so burner does work ok and was
recently serviced.

I have checked the following and all are fine:
Burner was recently serviced
Phototeye is clean
plenty of oil in the tank
System pressure is just above 1bar cold so that's fine
Electrics and timer look sound
Circulation Pump is sound

Any suggestions?

Thanks in advance.

 

[CombustionGuy]

Pcb
Control box
Oil pump
Motor
Solenoid
Faulty photocell
Stats
Electrodes
Blocked nozzle

Could be any of the above

 

[Burnerman]

As the burner isn't going to lockout I'd assume the problem was with timers, thermostats and similar......its just not getting the 'calling for heat' command, it seems.
John

 

[ChipperFred]

Pcb
Control box
Oil pump
Motor
Solenoid
Faulty photocell
Stats
Electrodes
Blocked nozzle

Could be any of the above

It's not the burner but thanks anyway

 

[ChipperFred]

As the burner isn't going to lockout I'd assume the problem was with timers, thermostats and similar......its just not getting the 'calling for heat' command, it seems.
John

Thanks for the reply

Yeah I reckon the burner is not getting the signal to start at all i.e burner light does not come on.

Timer is not the problem - have had the electrics tested .

Maybe a thermostat is the problem???