when I run the hot water tap the water is hot for about a minute then goes cold for approximately the same amount of time before it gets hot again, I ran the hot water and noticed the burner light on my combi boiler comes on then flashes when the water goes cold. My boiler is a ideal evo he c22/35. Can anyone advice me on what the problem is please.
Hot water running hot then cold
- Thread starter Bryan67
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When was it last serviced?
If it hasn't been for years then get it serviced and ask the engineer, before he arrives, if he could have a look at that issue.
If it hasn't been for years then get it serviced and ask the engineer, before he arrives, if he could have a look at that issue.
).Is this a new installation?
If so, it sounds like what happened with my Viessmann System. The installer probably did program the boiler to use the combi unit.
Look through your manual to see whether or not there is a way to program your boiler to use the combi unit.
For me, it was a series of turns on the boiler interface (hot water temp and boiler hot water temp control knobs)
If so, it sounds like what happened with my Viessmann System. The installer probably did program the boiler to use the combi unit.
Look through your manual to see whether or not there is a way to program your boiler to use the combi unit.
For me, it was a series of turns on the boiler interface (hot water temp and boiler hot water temp control knobs)
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Hi, thanks for your replies, my boiler is 9 years old and I have had it serviced regularly,last service was in august this year. I have turned the unit off and back on,changed the programme setting and still the same, the central heating is working fine it is just when I turn the hot water on that the burner switches off even with the central heating on. Someone suggested it maybe the diverter switch, does this sound correct?
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Try reading post 3 again!
I agree with post 3 also, secondary heat exchanger, have a look in your boiler manual where it is in the boiler and part number. Normally removed with just 2 screws, but you can find new ones for most boilers from about £50-£80, I changed mine last winter it was slightly clogged up with lime scale, I kept my old one and cleaned it up with strong lime scale remover took a couple of days of soaking, I will re fit my old one when this one fails and clean that one up. The last one lasted 6 years so might be a while yet.
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