Potterton Puma 80: CH ok but hot water only works when CH on

[mazzapoid]

Hi,
We have a Potterton Puma 80 boiler, several years old. When we first moved in in November, the hot water was very temperamental - it ran hot for a bit, then cold, then hot again. We had it adjusted and all was fine for a while.

Now, only 3 months later, the problem is back again. The hot water is fine when the CH is on, but if it's not on it runs alternately hot and cold. Also, the boiler fires when turning the cold tap off. Weird.

Can anyone suggest what we can do to fix this? We want to try and do it ourselves cos plumbers are expensive!

Thanks,
Mary

 

[corgiman]

souns like the DHW flow stich is stuck

 

[Agile]

"""We want to try and do it ourselves cos plumbers are expensive"""

Well thats fine if you can do it.

The advantage of paying someone is that they are expected to do the job properly and quickly.

As I dont know exactly what is causing your problem, I cannot be sure what parts are needed ( if any ). However, we would charge £84 plus parts. Is that really so expensive?

Tony

 

[mazzapoid]

Thank you for your replies, Corgiman and Agile.

As for 'plumbers are expensive' - sorry if I've offended you. We seem to have bought a house with lots of things in it that don't work, and are trying to work out what we can do ourselves and what is best left to the experts.

Would you say that unsticking the DHW flow stich is a DIY-able job?

 

[Agile]

I cannot answer that because I dont know your capabilities.

Its easy for me but then I do it every day. But then brain surgery is easy for a brain surgeon but difficult for me.

There is mains voltage and water mains pressure involved so there are some safety issues to consider.

Tony

 

[mmalone]

I cannot answer that because I dont know your capabilities.

Its easy for me but then I do it every day. But then brain surgery is easy for a brain surgeon but difficult for me.

There is mains voltage and water mains pressure involved so there are some safety issues to consider.

Tony

I'll answer it NO NO NO !!

Regardless of it only being the water section you are still inside the boiler.
rule 26/9 should be carried out after any repair and as you are not CORGI then NO !!

Pay the money and get it done right !!

 

[mmalone]

Hi,
We have a Potterton Puma 80 boiler, several years old. When we first moved in in November, the hot water was very temperamental - it ran hot for a bit, then cold, then hot again. We had it adjusted and all was fine for a while.

Now, only 3 months later, the problem is back again. The hot water is fine when the CH is on, but if it's not on it runs alternately hot and cold. Also, the boiler fires when turning the cold tap off. Weird.

Can anyone suggest what we can do to fix this? We want to try and do it ourselves cos plumbers are expensive!

Thanks,
Mary

If the boiler lights when no demand for c/h or h/w then you may find the DHW flow switch is staying on ... seen this on loads