How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Andrew Smith Your Own Question
Andrew Smith
Andrew Smith, Plumber
Category: Plumbing
Satisfied Customers: 3723
Experience:  City and Guilds qualified plumber
46681511
Type Your Plumbing Question Here...
Andrew Smith is online now

I’ve got a potterton promax combi 28 HE a, On heating

Customer Question

I’ve got a potterton promax combi 28 HE a,
On heating demand, the boiler temp rises quite quickly, but doesn’t heat the system. The first radiator gets warm but the return pipe is cold. The pump seems to be running and we have checked for blockages to the first rad but all is good.
We have also checked the filter on the return valve of the boiler. The hot water works fine.
Any ideas ?
Submitted: 1 month ago.
Category: Plumbing
Expert:  Andrew Smith replied 1 month ago.
It sounds like the pump is failing.
Try venting it through the cap on the top and the screw I the front.
How clean is the water in your system?