Ravenheat 820 Combi Hot water cuts out

Joined
13 Sep 2006
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Location
Buckinghamshire
Country
United Kingdom
Hi,

I have a Ravenheat 820 Combi boiler. For the last few days, the hot water has been cutting out. The boiler fires up and then after a short time it cuts off and fails to heat the water. Sometimes it will re-fire itself other times I have to turn off the water and turn it back on again.

The central heating seems to be fine and doesn't seen to cut out. I need to fully test this though.

Funny thing is that this morning I had a shower and it cut out once and was then fine for ten minutes.

Does anyone have any ideas about whats happening. I'm not a pro but if its a simple enough job then I'll try and do it myself.

Cheers
 
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The boiler should turn on for DHW with 2.5 litres per minute. If it needs much more than that then the diverter valve is failing.

If it always turns on reliably then there may be a problem with temperature control aspects or pump operation on DHW.

Tony
 

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