Hi my mother has a Worcester combi and called me to say hot water was scalding so told her to turn the hot water control down to 1 from 4 but no change. Housing association plumber called but don’t know when he can attend, anything I can try in the meantime or can anyone tell what’s wrong. Thanks
Combi hot water scalding
- Thread starter RobTi
- Start date
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Sorry don’t know it’s the one that can preheat your hot water if needed but this is set to off
Green star 28i junior
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Okay water scalding I switched it off at the wall and back on thermostat down at 1 on boiler and I get scalding water out the tap for around 20-30 seconds then just very warm mildly hot ( you can keep your hand under it ) turn tap off for 30 mins then the same again when turning tap on
sorry i'm not a heating engineer, i asked for the model number as i know others would when they come on the site later.
it sounds like the tap water is being heated up when the boiler is heating the house, and this is why you get 30 seconds of scalding water, i am unsure if the heating and hot water heat exchangers are a combined unit on these or not.
it sounds like the tap water is being heated up when the boiler is heating the house, and this is why you get 30 seconds of scalding water, i am unsure if the heating and hot water heat exchangers are a combined unit on these or not.
sorry no the boiler stat for hot water is under 1 the heating stat is around 5 ish just before the click when you can turn it up further. so i only tried this when i first went in and again 30 mins later. open hot tap decent flow you get around 30 seconds of scalding water then warm water for as long as you ru water, turn tap off anf go back later and its the same scalding water then warm after roughly 30 seconds
no sorry just going by what she told me and i didnt even look when visiting her
Definitely a Worcester combi with twin times on built in time clock so has preheat on the hot water
Probably a bithermal heat exchanger, you will get a slug of very hot water when the heating has been on as the dhw is sitting in the heat exchanger, warn your mum to run a tap for 30 seconds before putting her hands near it.
Anyway to stop it she’s nearly 90 and forgetful (suppose I could put a sign up) isn’t it compulsory to fit tmv’s
Only on a new build or alterered property, eg barn conversion, for baths
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