Potterton Puma 80e


18 Oct 2006
Reaction score
United Kingdom
Hi all,

After running the central heating for an hour the rads only get slightly warm. I have flushed the system recently. The Flow pipe from the Puma 80e only gets slightly warm as well. It does however have bursts of getting very hot for a few seconds. The boiler is constantly on full fire and doesn't cut out. The hot water taps and shower work fine. Any suggestions.
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Start with changing the diverter valve, this should cure the problem
It's true, the boiler stays on and doesn't cut out at all, i've watched it for 20 minutes. I agree the heat has to go somewhere, its a combi boiler other than a hot water tap where else can the heat go. As i said there are bursts of very hot water through the flow pipe for a few seconds.
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On FULL flame it would boil v quickly.
As the man says, sounds like Diverter, but could just be the pump messing about I suppose. Haven't seen either work in bursts :confused:
The hot water taps and shower work fine. Any suggestions.[/quote]

Can't be the pump then
ChrisR How do you do that quote highlighted thing?
guys I haven't got a manual for the boiler, where abouts is the diverter valve located.
The hot water taps and shower work fine. Any suggestions.

Can't be the pump then
But Pumas are quite happy to provide HW with the pump not working, it can get a bit hot.
I think i'm stuck with the worst boiler on the planet! The tap water does actually fluctuate in temperature, sometimes very very hot.
How can I check if the pump is faulty, i've checked and there is voltage ok to it. Is there anyway I can check it before replacing it with a new one.
I think i'm stuck with the worst boiler on the planet!

Search on Pump and you'll see how to test it

The Potterton site would have told you the manual is at partsarena.com/baxi
Thanks ChrisR, Got hold of the manual. Will check both pump and diverter value. let you know how I get on.
it would help if you checked the burner pressure or gas rate. the burner may not be full on.

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