Boiler issue?

Soldato
Joined
7 Mar 2005
Posts
6,918
Location
Wolverhampton
Hi guys,

The water in my mixer shower doesn't stay at temperature for long, it will drop to ice cold for 15 seconds then return to hot. Then repeat

The hot water taps are the same, when the shower goes cold the hot water tap does to.

The boiler is only 2 years old, any idea what this could be?
 
I had this issue on my shower, worked fine then started doing exactly as you described. Would be the right temp then would suddenly go to ice cold and after 10 seconds or so go back to the right temp. Rinse and repeat depending on the length of the shower

Called someone out but while waiting I bought a new shower head that uses less water and it suddenly fixed the issue. I was a bit perplexed as to why that fixed it but when calling to cancel the appointment, the guy explained that it can be a water pressure issue, and if we adjusted the settings on the shower head and more water was flowing then the boiler can't keep up*.


* Forgive my extremely non-technical explanation, that's just what I understood from what he explained amongst the jargon :D
 
If a Combi:

Sludge/sediment build up in the hot water heat exchanger of the boiler. This causes the boiler to cycle as it cannot efficiently transfer heat. This is normally not a fault of the boiler just the amount of muck in the system thats clogged the boiler. Your installer should have flushed the system out, chemically treated against corrosion, and ideally fitted a filter on the return pipe. But all that depends on how good he was at the price he charged/quoted.

Mick
 
Interesting issue with the shower head, i did try change them but didn't fix the problem.

I'm leading towards the heat exchange being clogged as its the taps to.
 
If a Combi:

Sludge/sediment build up in the hot water heat exchanger of the boiler. This causes the boiler to cycle as it cannot efficiently transfer heat. This is normally not a fault of the boiler just the amount of muck in the system thats clogged the boiler. Your installer should have flushed the system out, chemically treated against corrosion, and ideally fitted a filter on the return pipe. But all that depends on how good he was at the price he charged/quoted.

Mick

Exactly the same as I had with the same symptoms. Flushed system and had a Fernox filter fitted. Fitted new heat exchanger and all was well. I was told you can clean the heat exchangers out but it wasn't easy on the one I had. My old boiler was awful (Ideal Isar) and had regular issues!
 
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