Back boiler won't fire up

[Bullbags]

Help please.
I've just installed new bathroom suite and in doing so I turned off the hot water at the programmer and drained h/w cylinder down to install shower pump.
Bungalow has a back boiler and now that I'm finished I've turned the h/w back on and the back boiler won't fire up so no hot water!
Fuse ok at programmer (red light on)
Pump getting hot but doing nothing.
Pilot light on at gas fire.
Any ideas please as to why boiler won't fire up?
Nothing been altered apart from turning prog off. All working fine before I did that.
Many thanks.

 

[charliechaplinspants]

pump seized, doubt it, or programmer not working/ reset correctly. Normally a fused spur next to back boiler on side of breast wall, is it switched on?

 

[simond]

Prog must be OK if pump running.

If you have drained hot water cylinder check overheat stat on boiler.

 

[Bullbags]

Simond,
How do I check overheat stat? Where should it be, what does it look like?
Cheers

 

[gas4you]

What BBU is it?

Even with a failed pump, I would expect the boiler main burner to fire up, albeit only for a few seconds until the boiler stat shut off as the still water heated up very quickly.

 

[gavinda]

have you checked the pump to make sure its definetly not seized (bleed screw) and did you maybe turn the boiler stat and or cylinder stat down too when you turned off the boiler.

 

[bellairaphon]

is the pilot light on on the back boiler unit? not just the fire?

 

[BingoBongo]

what are the stats at in this bloody weather

 

[gavinda]

i know... im back in tomorrow, and dreading it. our new uniform shirts are bloody sailcloth or suchlike... i break a sweat just walking to my van