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Many thanks for all the help and the link. Looking at it I think it would be wise to start with just replacing the head as you suggested. Is there any recommended cleaner to remove the black crud on the pump housing that is still in the combi? Regards FarmerJohn

Thanks for the reply. It would seem that I have two choices. I could just replace the motor part of the pump and use the existing housing in the combi. This would be quicker but would be mixing new parts with old. Or I could replace the entire pump assembly which would take much longer...

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...

Hi, Thanks everyone for the advice. I will get the gas pressure checked and also see about the red LED on the control PCB. As it happened about a year ago I had terrible problems with the boiler which eventually turned out to be several dry/broken joints on the control PCB connectors...

Hi, We have Potterton Puma 80 combi and for as long as I can remember if the central heating is on and the hot water is switched on too quite oftem the gas will go out along with the pilot light. The only way to get the boiler back on is to go through the procedure of starting the pilot...

Hi, Yes balancing was the problem. For some reason I had convinced myself that I needed to run all the radiators with the lockshield valves fully open. Rebalanced as per FAQ and now the system is working correctly. Many thanks for all the replies. Regards FarmerJohn

Hi, We have a Potterton Puma 80 combi which came with the house so I am not sure how old it is. The problem is that it takes ages for the radiators to warm up especially those at the end of the run. Just lately it appears to be getting worse. When the central heating is switched on...