Morning all
I've had a bit of a disastrous wkend and am hoping I can get some much needed advice before I call in an engineer.
I have a 3 story town house with a couple of rads on ground floor that don't get very warm . Heating is a sealed system, British gas 300+ boiler, 14 rads, 11 small,1 medium, 2 large.
I bled and balanced system, still colder rads on ground floor. They get hot at the top but cool at the bottom.
Possibly sludge I thought so removed and cleaned ground floor rads.
That's where my problems started, after I'd refilled sytem and put boiler on it tripped out with an " f22 dry" message. I soon found that the pump (circulatingpumps cp63) wasn't spinning. Once I'd manually spun it it took over and everything was ok. The next issue was every time the boiler turned off then back on the pump failed to start and needed manually starting. I tested the resistance of the impellor ( finger test) and it was fairly week. This and the cold downstairs rads led me to buying a new pump ( grundfos alpha2).
I swapped pumps and now boiler is cycling and tripping out with "f25 diff" message. This relates to either an airlock or too high or low differential on the flow and return to the boiler according to the hand book. I re bled system and have tried pump on each setting, no joy . Any suggestions welcomed. Cheers Chris
I've had a bit of a disastrous wkend and am hoping I can get some much needed advice before I call in an engineer.
I have a 3 story town house with a couple of rads on ground floor that don't get very warm . Heating is a sealed system, British gas 300+ boiler, 14 rads, 11 small,1 medium, 2 large.
I bled and balanced system, still colder rads on ground floor. They get hot at the top but cool at the bottom.
Possibly sludge I thought so removed and cleaned ground floor rads.
That's where my problems started, after I'd refilled sytem and put boiler on it tripped out with an " f22 dry" message. I soon found that the pump (circulatingpumps cp63) wasn't spinning. Once I'd manually spun it it took over and everything was ok. The next issue was every time the boiler turned off then back on the pump failed to start and needed manually starting. I tested the resistance of the impellor ( finger test) and it was fairly week. This and the cold downstairs rads led me to buying a new pump ( grundfos alpha2).
I swapped pumps and now boiler is cycling and tripping out with "f25 diff" message. This relates to either an airlock or too high or low differential on the flow and return to the boiler according to the hand book. I re bled system and have tried pump on each setting, no joy . Any suggestions welcomed. Cheers Chris