It a Worcester Combi (sorry don't know the model, think it an eco something - can check tomorrow), 5 yrs old in Dec, large capacity - in a church hall (where I work).
This has been a problem for a while but recently seems to be getting worse. Today it has been terrible.
The hot water goes boiling hot (almost scalding) and then goes cold.
I know at one point (just after Covid when hall had been closed for a while) the caretaker turned up the heat of the water cos of a notice about Legionaires disease (which actually I don't think was an issue cos it is a combi not tank - we did flush the loos a few times and run the taps to flush the feed pipes). I turned it down a few months later as it was too hot for children washing their hands (and caretaker was off long term sick)
It has been serviced since, a few years ago the plumber tried to do something to try and stop the radiators going off everytime the hot water was being run ...(hall is hard to keep warm in winter). I don't think this was particularly sucessful ...although it has been freezing yesterday/ today I don't think this is the problem? (also I think it was still doing it when the heating had gone off)
Yesterday I turned the hot water temp down even further (to 45 deg), it has a preheat or eco setting - it is set for preheat. I would say the water was much hotter than 45 deg before it went cold - too hot for me to put my hands under. It really does seem like it is some kind of scald protection cut off. Sometimes it seemed ok, just not very hot, then at other times it went really hot and then cold. I was on my own when it was at its worst so couldn't check what the boiler was doing/if there was an error message etc.
So does this sound like it could be some setting - one that I could I could tweak? Or does it sound like a fault - do I need to get the hall owners to get a plumber out?
(Reluctant to ask for a plumber just now if it is just a minor setting or something - we are the main users and a week ago another user told us they had received an electric shock from a (plastic) light switch, resulted in a co-worker panicking, getting an emergency electrician call out ...who could find nothing wrong and suggested it must have been static....)
This has been a problem for a while but recently seems to be getting worse. Today it has been terrible.
The hot water goes boiling hot (almost scalding) and then goes cold.
I know at one point (just after Covid when hall had been closed for a while) the caretaker turned up the heat of the water cos of a notice about Legionaires disease (which actually I don't think was an issue cos it is a combi not tank - we did flush the loos a few times and run the taps to flush the feed pipes). I turned it down a few months later as it was too hot for children washing their hands (and caretaker was off long term sick)
It has been serviced since, a few years ago the plumber tried to do something to try and stop the radiators going off everytime the hot water was being run ...(hall is hard to keep warm in winter). I don't think this was particularly sucessful ...although it has been freezing yesterday/ today I don't think this is the problem? (also I think it was still doing it when the heating had gone off)
Yesterday I turned the hot water temp down even further (to 45 deg), it has a preheat or eco setting - it is set for preheat. I would say the water was much hotter than 45 deg before it went cold - too hot for me to put my hands under. It really does seem like it is some kind of scald protection cut off. Sometimes it seemed ok, just not very hot, then at other times it went really hot and then cold. I was on my own when it was at its worst so couldn't check what the boiler was doing/if there was an error message etc.
So does this sound like it could be some setting - one that I could I could tweak? Or does it sound like a fault - do I need to get the hall owners to get a plumber out?
(Reluctant to ask for a plumber just now if it is just a minor setting or something - we are the main users and a week ago another user told us they had received an electric shock from a (plastic) light switch, resulted in a co-worker panicking, getting an emergency electrician call out ...who could find nothing wrong and suggested it must have been static....)
