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Andrew Smith
Andrew Smith, Plumber
Category: Plumbing
Satisfied Customers: 3629
Experience:  City and Guilds qualified plumber
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Boiler fires up after about 15seconds flame goes out then reignites

Customer Question

Boiler fires up after about 15seconds flame goes out then reignites ,same on heating and dhw
Submitted: 2 years ago.
Category: Plumbing
Expert:  Andrew Smith replied 2 years ago.
***** ***** : Is the boiler continuing to spark during the full period?
JACUSTOMER-96phaa17- :

No , the dhw fires up ok as with the ch, the burner ignites ,everything normal for about 15 -20 seconds then burner cuts out and process repeated again and again.

***** ***** : The boiler does no know it is lit, or the water is not circulating.
***** ***** : can you hold the two heating pipes under the boiler and tell me if they get hot at all?
JACUSTOMER-96phaa17- :

the pipes don't get hot because the boiler does not run long enough.

***** ***** : Can you check the pump is actually spinning by taking the screw out of the centre?
JACUSTOMER-96phaa17- :

yes the pump is working

***** ***** : Can you follow where the heat goes in the first 15 seconds it is firing?