Potterton Puma 80 combi

[Agile]

If you do not remember ( or know ) what the resistance should be you measure the CH and the DHW sensors with the boiler cold and see if they are similar.

A surprising number of boiler MI do not actually give the resistance of the sensors.

My favourite manufacturer gives a graph of the resistance versus temperature!

Tony Glazier

 

[plumbingnovice]

Many thanks to those who replied to my post for all the advice. Been busy so never had the chance to try some of it yet.

A couple of other things I noticed this morning, when the boiler is on my radiators get really hot even though the CH is off. Should I be worried?

Secondly I can't find a thermostat in the whole property, there are a couple of controls on the boiler for DHW & CH temparature but I would have expected a thermostat somewhere. Is this unusual?

 

[Agile]

Great expectations!

It was always good practice to fit one! It is now a requirement of the building regs.

Few recent installations actually have one fitted. A fairly simple job and the cost can often be recovered within a year on fuel savings.

If you cannot find one then its probably because you dont have one!!!

Tony Glazier

 

[ollski]

Diverter valve is shot.

 

[plumbingnovice]

Looks like a pretty confident diagnosis ollski.

Should I suggest this to the engineer as a place to start?

 

[Agile]

If I was called, I would definately prefer to be allowed to diagnose the problem on my own.

Unles the client pays cash in advance AND signs an indemnity, I never replace parts that the client THINKS are faulty! They are usually NOT the problem!

Tony Glazier

 

[gstens baxi]

PROBABLY NOT THE DIVERTER VALVE BUT THE DIFERENTIONAL PRESSURE SWITCH AS DIVERTER WILL SWITCH TO HTG WHEN NO DHW DEMAND.

 

[kevplumb]

STOP SHOUTING

 

[gstens baxi]

SORRY

 

[fantazia]

What was the outcome? I've got exactly the same problem.

 

[ChrisR]

Aaargh - check for the red llight on your pcb. It should be OFF whn your HW is off, else your rads will go to v hot and the boiler will shut off.

Otherwise start a new thread!