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Thanks for your reply. I will check and report back. Never been serviced although I did reset earlier to try and resolve the issue.

Thanks TANFC - alas my boiler is a system boiler, not a Combi and the troubleshooting guide is really for terminal issues.

Bumping for prime time heating engineers on the board- I thought they might have all already knocked off for the day when I posted at 15:00 but maybe I was wrong #brexit #barberout

Afternoon NSC, The above boiler has operated faultlessly for the past 5 years. However, I have noticed that the DHW for the past few days has not been as hot or lasted as long as previously - been using the immersion to help. Not sure on tank size as at work currently. I have turned it off...