Originally posted by: Real Boiler Servicing & Maintenance Ltd
Sounds like a circulation issue, the heat exchanger may be blocked, it could be a weak/faulty pump, incorrect gas pressures, or even be a simple thing like trapped air, the list goes on......
I don't see an issue with letting the engineer replace the pump if they feel that's the issue. I would recommend you make it clear that your looking for a complete solution rather than a replacement pump, and that you will not be happy to pay unless your issue is resolved, that way your not just throwing parts at it over and over again, which often ends up as an expensive experiment.
If I am not wrong this is an older model combi, maybe 15 years I might also suggest looking into an upgrade which might be cheaper in the long run.
all the best hope that helps.
Thanks for the quick response. As I thought, it is a difficult one to pin down so before I start throwing pound notes at it I might just think about an upgrade. Your opinion is valued.