potterton puma 80

[samerlin]

just discovered this site can any one give me some advice
I have a potterton puma combi boiler I have hot water but no central heating. if the pump is cold and I use switch on boiler to switch on ch the boiler fires up for a few seconds then switchs itself off
any ideas please

 

[ollski]

Try isolating the cold mains to the boiler and then see if the heating comes on.

 

[Mikeyboy]

Most likely to be a failed wax capsule type diverter valve within your boiler has failed. Other things to check , is the auto air vent operational , not sludged with corrosion.Also ensure pump is operating. This type of boiler , on demand for heating , fires up the burner , pump runs and circulates water thro diverter valve . The wax capsule , on sensing heated water , expands and moves a steel rod within the valve , to open to the heating port.This results in heated water circulating to the radiators.BUT , if you have any dripping hot water taps , or , a water leak on any part of the domestic hot water pipework leaving the boiler , the valve will fail to open. Hope this is of use to you . If not , use an engineer familiar with this boiler , to effect a repair .Alternatively , BAXI/POTTERTON , and B.GAS . ,will carry out a fixed price , guaranteed repair.

 

[gazthepottertonengineer]

Sounds like dripping hot tap syndrome to me make sure you havent got any dripping hot taps that is

 

[samerlin]

Thanks for your replies.
would the boiler fire up at all if the pump was needing replaced
do I have to turn off the cold water supply.
when I had a bath last night I discovered that the hot water tap had been left dripping all day but I tried the ch again today after making sure the taps were turned off and again the boiler fired up lasted a few minites then turned itself off
what do I do next?