no water no heating working potterton puma 80 4759010?

Fan failure. These fans cost £100+. If the fan is rough to turn by hand the bearings are worn-out. I was up and running again for a total of £2.80 plus two cold nights without heating. 6x19x6 bearings readily available on eBay 99p each plus postage. Quite tricky to replace but worth the agro and very satisfying.

meatbasher
February 2010

Could be Raj.
There should be a fault diagnosis chart on the inside of the front cover. I'm assuming you've followed it and its told you to replace the fan.
before proceeding does the "HWDEM" LED light when you turn on the hot tap? (It should!)
Can you hear the fan turning? If so then its unlikely to be the problem

If you need to get to the little bugger:
Its is at the top of the unit, Its been about 6 years since I did this but I remember its relatively easy to get to. Take it out (remove all power before doing ANYTHING!) and see if it will turn VERY easily and keep turning. If not it does need replacing.

Its a relatively easy job for the DIY geezer but if you have ANY concerns I'd call in a plumber to do it.
A new one costs between £60 - £100ish and a plumber would probably add another £50 - £100 on top to do the work.

Riggsy
October 2007