boiler start/stop

[apcdave]

Hi all,

It's a Warmflow 70/90 System boiler - I had to drain the system down to replace some rad valves. Upon refilling , it fires up and runs for maybe 15 mins then stops for a couple of mins then starts again. It's like the thermostat is operating too early - is this perhaps because of air in system somewhere? if so any hints in chasing it out - it is a sealed system and haven't really had any problems with sealed systems before....

muchos gracias

apcdave

 

[rsr]

Likely to be air. Keep venting from all the usual places and get the pump running (boiler not firing) to circulate the system water and hopefully push the air to a venting point.

 

[dontknowitall]

Could be pump solenoid, oil starvation*, pump or faulty photocell. (That order if memory serves correctly.) What's the make and model of the burner?


* I've had one or two before where the fire valve has a blockage which allows oil through but not enough to supply the burner continuously. Burner stops, oil seeps through gradually then 1/2 hour later or so there's enough to keep the burner going for a little while.

 

[kimbo]

Bleed the pump if its cavitating it wont circulate the water properly and get the heat away from the boiler.