potterton puma 80 and alpha cb25 faults

[dave1973]

Hello all, dont really use this forum much but would like to know if anyone could help. Firstly I manily do installation not fault finding hence my questions. Customer has called to say her puma 80 has hot water but no central heating. There are apparently no external programmer or room stat. I read up and it could be ch thermistor ,no problems with that. The other possible quoted was micro switch from divter. My question is why could it be a micro switch if this operates ok in dhw mode?
My second question was an alpha cb25 combi , a friend told me when calling for hot water the boiler wont fire up and comes on on the second attempt. was thinking faulty flow switch,micro switch or board. Has any one experienced this? Just wondered. Thanks for any info would like to slowly break into fault finding find is very interesting so far thanks


David

 

[Agile]

I suggest you register and ask trade questions in the CC part of the site.

Better one post per question.

Tony

 

[Beerlover]

Hi Dave,

The puma check for any dripping hot taps this will hold off CH, isolate incoming mains to boiler and see if heating now works. Wax diverter could have failed. For correct operation check; CH calling for heat, run hot tap for 10 secs and shut off, the flames will drop down and shut off but will reignite within 45 secs - hold the flow pipe to check this is the case.

The Alpha may be a dhw diapragm but could be other things not for this forum. With the switch removed, run the hot tap, the pin should move qucickly and firmly forward. if not diapragm may be split.

Although Agile is a bit scratchy, if you are an installer? you can get on the CC. Expect more abuse there

 

[Agile]

Scratchy?

While the Puma is unlikely to be a gas related cause, your Alpha fault quite possibly is.

In the CC we can advise you of all the possible causes including gas and include info on how to fix as well.

Tony

 

[ChrisR]

In the puma check the pump is working. the boiler's pretty much happy to work on HW with a dud pump.

If the hot water flow switch were stuck on, it would keep overheating.

 

[bengasman]

You will have to go there and do some basic checks, I can think of half a dozen things that would cause the problem on the puma.

Getting access to cc now is a good idea for when you do have a gas related question.