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I have a Potterton Puma 80 combi which for some time now has not been heating the 8 radiators properly in the house. It takes hours for some radiators to warm up and I have noticed that the return pipe to the boiler (22mm) never gets all that hot.
I have recently balanced the radiators but it still takes hours for all the radiators to warm up. After about a week or so, however, it was back to its usual problems where some radiators would go cold after warming up.
I spoke to a plumber and we suspected that there may be a problem with the central heating pump. As an experiment I completely removed the large black octagonal plastic screw from the pump and water and steam came out across the room at some incredible rate.
The pump itself has now been removed and is marked as MULTI HEAD III and appears to be of British Gas make. I have some questions.
Should water come out at pressure if this octagonal screw is removed? I was of the understanding that its purpose was to release air from the system and that it could be removed even when the system is pressurised.
The pump housing is pretty well caked up with a black deposit, would this make a significant difference to the pumps effectiveness? When the pump runs it is pretty well silent as expected.
Regards FarmerJohn
I have recently balanced the radiators but it still takes hours for all the radiators to warm up. After about a week or so, however, it was back to its usual problems where some radiators would go cold after warming up.
I spoke to a plumber and we suspected that there may be a problem with the central heating pump. As an experiment I completely removed the large black octagonal plastic screw from the pump and water and steam came out across the room at some incredible rate.
The pump itself has now been removed and is marked as MULTI HEAD III and appears to be of British Gas make. I have some questions.
Should water come out at pressure if this octagonal screw is removed? I was of the understanding that its purpose was to release air from the system and that it could be removed even when the system is pressurised.
The pump housing is pretty well caked up with a black deposit, would this make a significant difference to the pumps effectiveness? When the pump runs it is pretty well silent as expected.
Regards FarmerJohn