Can anyone help me diagnose this - I'm not sure where to go from here other than shelling out on a new CH pump in the hope thats where the problem lies...
Last night the CH system developed a leak upstairs. Judging by the size of the puddle (large) and the rate at which the water was escaping (a dribble) , I'd guess that it was whilst the system came on in the early hours of the morning and had been undiscovered for about an hour.
I drained down the system and made good the leak. I then refilled and bled everything twice - radiators,pump, the vent/bleed above my HW tank.
Now when I switch my boiler on (An Ideal Standard Classic non-combi) it lights for between 30s and 60s before switching off. I've checked the pumped flow pipe from it and this gets very hot. The return into the boiler stays cold. Its as if the boiler is heating static water and the thermal cutout is coming in to effect.
I've checked the CH pump (by ear) it's running but quiet so it doesn't *sound* as though the bearings are damaged. As the boiler brings the water up to temp i can hear some gurgling in the boiler pipework - the return i think. I dont know if this is sluggish water getting boiled by the boiler or trapped air trying to move though.
Could it be a trapped airlock in the pipework (If so, how can i expel it?)
or is it possible that the pump bearings are quiet but its somehow damaged by the leak enough to be unable to shift the water?
Any help gratefully received. I don't want the hassle and expense of replacing the pump unneccesarily..
All the best,
Darren
Last night the CH system developed a leak upstairs. Judging by the size of the puddle (large) and the rate at which the water was escaping (a dribble) , I'd guess that it was whilst the system came on in the early hours of the morning and had been undiscovered for about an hour.
I drained down the system and made good the leak. I then refilled and bled everything twice - radiators,pump, the vent/bleed above my HW tank.
Now when I switch my boiler on (An Ideal Standard Classic non-combi) it lights for between 30s and 60s before switching off. I've checked the pumped flow pipe from it and this gets very hot. The return into the boiler stays cold. Its as if the boiler is heating static water and the thermal cutout is coming in to effect.
I've checked the CH pump (by ear) it's running but quiet so it doesn't *sound* as though the bearings are damaged. As the boiler brings the water up to temp i can hear some gurgling in the boiler pipework - the return i think. I dont know if this is sluggish water getting boiled by the boiler or trapped air trying to move though.
Could it be a trapped airlock in the pipework (If so, how can i expel it?)
or is it possible that the pump bearings are quiet but its somehow damaged by the leak enough to be unable to shift the water?
Any help gratefully received. I don't want the hassle and expense of replacing the pump unneccesarily..
All the best,
Darren