potterton puma 80

[dean98]

Hi there
Customer has problem with potterton puma 80. power board was tripped just the once , reset then had to relight boiler, since then pilot has gone out once,
now
on hot water the boiler fires up but water
not very hot only luke warm ,on heating boiler fires up one of the the pipes from the boiler gets extremely hot then after about a minute boiler cuts out
and then fires up again and so the process goes on. but pilot is remaining alight , any ideas?
Thanks Dean

 

[hellomum]

lazy pump or faulty wax diverter, is the thermostat turned right up?]

 

[gas chap]

is the pump running ?

 

[dean98]

thanks for the quick reply
makes no difference if thermostat is low or high

 

[dean98]

pump is running gas chap

 

[gas chap]

It may soud daft but is there a dripping hot water tap.

 

[dean98]

no gas chap, no dripping or leaking taps turned off isolating valve on cold inlet to test for that

 

[gas chap]

When you say the power bord has tripped,

in what way, ?

 

[dean98]

I was not there but was told that a fuse had blown and all the power to the building was off , not sure if it was connected to the boiler or not , you would have thought that only the fuse in the fused spur had blown if so

 

[Softus]

1. Turn off all hot taps.
2. Turn off CH.
3. Get a helper to stand by a hot tap.
4. Turn on CH - check that burner ignites and observe the height of the flames.
5. Get helper to open a hot top - observe the effect on the flames.

If flames don't change, then suspect the PCB or the DHW gas valve solenoid.

To test the latter, turn off electrical supply to the boiler, get someone competent to remove the casing, disconnect the GV, and measure the resistance. Please post the measurement here.

Also, carefully re-energise the boiler, turn on a hot tap, and measure the voltage to the DHW GV soleniod. Please post the measurement here.

 

[dean98]

ok softus ,thanks will test and report back
cheers dean