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Ask Andrew Smith Your Own Question
Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3633
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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Have a baxi 105he hot water and CH functioning at boiler.

Customer Question

Have a baxi 105he hot water and CH functioning at boiler. I.e. is heating hot water and is heating water for CH but no heat reaching radiators
JA: How long has this been going on? And how severe is the problem?
Customer: Boiler stopped working b4 Xmas when pump was changed. Hot water OK but radiators still cold even though boiler is on burning gas heating CH water pump running but no output at rads
JA: Do you plan on doing the work yourself?
Customer: I'm a a gas safe heating engineer
JA: Anything else we should know to help you best?
Customer: Pump was changed by a previous engineer both diaphragms on 3 way valve seem OK as push rods activating micro switches. Just wondering if valve is blocked or stuck in dhw mode
Submitted: 9 months ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 9 months ago.

Are the pipes under the boiler getting hot?

Are the valves under the boiler actually open (take the heads off and check.

You need to ensure the pump is fully vented or it will not move the water

Customer: replied 9 months ago.
Flow pipe is hot return pipe not as warm as would be expected. Valves are functioning correctly but I will strip down and check them.
Expert:  Andrew Smith replied 9 months ago.

ok, let me know how you get on