Hot Water but no Heating - Potterton Puma 100

[pmdsl]

I have a Potterton Puma 100 gas boilerl, last night i noticed it was quite cold in the house, I checked to see if the timer had switched off, the timer was still on but there was no heating.
The Pilot light is on, when I turn the hot water tap the boiler fires up and I get hot water but I don't get any heating, I have tried setting the heating to constant, still no heating

Any Ideas??? The house is freezing, Help!!!!!!!!!!

I've got a tool box and I'm not affraid to use it (just don't know what to do with it!!)

 

[ollski]

Been quite a few similar posts recently, check for a dripping hot water tap or leak on hw pipework, then suspect the wax capsule in the diverter valve. I have also had a couple of faulty ch sensors.

 

[pmdsl]

Thanks for that,

One thing, what is a diverter valve and where would I find it??

 

[gazthepottertonengineer]

the other poosibility is the central heating connection on the top of the pcb

Does the boiler run for about 10-20 secs then cut out or is it not coming on at all with the heating on

 

[pmdsl]

the boiler does not come on at all.

How would I know if the CH sensor was faulty?? is it easy to replace? how much would it be?

thanks again

 

[ChrisR]

Mfrs Instructions are at Partsarena.com/baxi.
Check resistance of CH sensor in situ, compared with the identical HW one.
There are many many posts on your problem, with this boiler, please spend 10 minutes reading..!

 

[gazthepottertonengineer]

to me it sounds like you have a dry joint on the pcb connection at the top in the middle

 

[pmdsl]

to me it sounds like you have a dry joint on the pcb connection at the top in the middle

Gaz, you are a feckin genius!!!!!

A dry joint, on top left hand corner connector (PC1) right in the middle. Got the old soldering iron out and hey presto, hot radiators and a happy wife!!

God bless you Gaz, have a very merry Christmas and a happy new year!!

 

[ollski]

Fair play Gaz, looks like Kevs cyrstal ball is now redundant ....or has this happened before? , I can't imagine a potterton with a dodgy pcb.

 

[Agile]

Since the boiler worked on DHW then I would have assumed the PCB was OK and that it was more likely to be the diverter valve or a dripping tap!

Just shows that you cannot guess right every time!



Tony

 

[gazthepottertonengineer]

Glad to have been of assistance