Potterton Puma 80e - Hot Water & Control Problems

[jb73118]

Apologies if these have been asked before - have searched the forums but am still not clear!!

For some time I have had deteriorating hot water pressure, to the point that it is now painfully slow. Following the advice on here, I have replaced the diverter valve with no improvement (so now I suspect scaled heat exchanger??)

Having put it all back together, I now seem to have managed to cause a control fault. As soon as I switch the power on, both the Mains On and Flame lights come on, and so when I switch the thing out of standby it immediately locks out - I've tried looking at the fault finding charts in the manual (on partsarena.com), but these are unreadable on there.

Can anyone helo with suggestions of what to try next??

Thanks

 

[gazthepottertonengineer]

definately sounds like scaled heat exchanger but check the flow restricor first

other problem ive never seen or heard of before but sunds like possible pcb

 

[jb73118]

Thanks. Will check the flow restrictor when I get the chance.

Found a new FSC PCB on ebay and seller was less than an hour away. Won the auction, so £20 for a brand new FSC PCB and at least I've got hot water again - albeit a trickle!!

 

[Agile]

I presume you mean low FLOW rather than pressure from the hot water tap?

Thats usually caused by a faulty flow restrictor which is in the inlet pipework at the back left. Quite tricky to get to.

Tony

 

[jb73118]

Sorry - did mean flow.................

When the tap's first turned on, pressure/flow is great, then it quickly drops off.

Just tried winding the flow restrictor to max and it's made no difference. Will try changing that next, then will have to look at getting the heat exchanger de-scaled...........

 

[ChrisR]

JUst testing - try this for Puma E fault finding - I know it says P at the top..:here
CLick the button which appears, to expand it.

 

[doitall]

What program do you use to save text as a jif Chris.

 

[ChrisR]

Adobe Photoshop John.
But you could probably display the page on the screen, hit Print Screen, paste into Paint and join up say 2 screens, then post as a .bmp image.

 

[doitall]

Ok I'll try that

 

[Agile]

Er. you cannot adjust the flow restrictor!

Its a little rubber "O" ring in a plastic bit just where I said it was!

Tony