Hot water - Plumbing Forum | Plumbers Forums

romany123 · 24-04-2008

I hope I have posted in the right place.

I have a condensing boiler, it is a ravenheat fanned combi CSI 85-CSI85T. just over the last few days we have been having problems with getting any hot water when the C/H is switched of (seems ok with it on) We have switched to water only. it seems to get warm then reverts to cold.

Any ideas would be appreciated

Many thanks

Dave

cabbadge · 24-04-2008

Sounds like it could be the dhw thermostat! try turning it up. and check the boiler is firing whilst your hot bath tap is running. another cause could be too much flow of water. i would get out a professional.

romany123 · 28-04-2008

I think you are proberbly right, I will phone them today.
Thanks for the reply.

ajs heating · 28-04-2008

sounds like the dhw diaphragm is faulty.

cabbadge · 28-04-2008

Yeah didnt think of that one. well done ajs

romany123 · 05-05-2008

I have got the DHW Thermostat.
Do I need to turn of the main water supply before I unscrew the old one? can somebody talk me through it. I am sure it is not rocket science. The guy that was going to do it diddent turn up. I have the part, I have the spanner, all I need is the wherwithall

Dave