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Plumberpro
Plumberpro, Mechanical Engineer
Category: HVAC
Satisfied Customers: 634
Experience:  Over 20 years experience in plumbing heating and gas
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I have a biasi combi boiler, hot water fine. central heating

Resolved Question:

I have a biasi combi boiler, hot water fine. central heating not good.
when heating comes on it lights for about 5 mins then goes out. radiators warm
if I turn water temp switch off for a few secs, then back on boiler lights for a short while
then goes of again, room stat is set right . all radiators bled. any ideas?
also bar pressure ok.
Submitted: 2 years ago.
Category: HVAC
Expert:  Plumberpro replied 2 years ago.
Plumberpro :

Hi . could be the heating temperature stat is faulty.blocked

Plumberpro :

Blocked heat exchanger. Weak pump.

Customer:

after flame goes out water being pumped sounds like full of bubbles . but when I vent no air in system

Plumberpro :

Ok . is the pressure ok?

Customer:

yes

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