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A sentinel Descaler was used and an inhibitor put in the system after. I have been reading air temp sensor in the flue could cause an issue.

Sorry??? How do you 'very much doubt I managed to clean the heat exchangers myself'? I took both exchangers off the boiler and used a descaling solution on them. I also flushed the system through. Neither of these have made a difference.

Hi all, am after some advice. I'm having some problems with the DHW. When running a tap, the boiler is getting to approx 70, the flame cuts out, boiler cools down, then flames reignites after approx 25secs. I does this everytime the boiler reaches approx 70. So as you can imagine, this is very...