Ask The Trades - Print Page

Ask The Trades
https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> New combi - no hot water https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1112618748 Message started by DavidG1305 on Apr 4^th, 2005, 1:45pm

Title: New combi - no hot water
Post by DavidG1305 on Apr 4^th, 2005, 1:45pm

Sorry to post yet another 'new boiler' question. Hoping someone can help.

As part of a loft conversion, we replaced the old boiler system.

The old was a 'traditional' open vented boiler system with a pump and a hot
water tank, a salamander shower pump and a Bensham thermostatically
controlled shower mixer. The new is a Worcester Bosch (WB) 28CDi RSF combi
in the loft.

Since installation (by a plumber working for the building contractor) the
heating has been fine, but the 'hot' water has been tepid.
The plumber went through the trouble-shooting routine, said that a flow
sensor was defective and called WB. Today the WB guy came, tested
everything.
He says the sensor is fine but that we had a 'cross'leak'. He thinks that
the shower mixer is allowing cold water up the hot side and into the taps
(which he tested by switching off the hot supply and getting a good flow of
cold water out of the bath hot tap).

The local bathroom place says this is a good quality mixer suitable for
mains pressure and disputes the diagnosis. Any thoughts please - just trying
to make sure i'm not getting dicked around and looking forward to a hot
shower again.

Title: Re: New combi - no hot water
Post by thescruff on Apr 4^th, 2005, 6:12pm

Won't be the first, good quality stuff from over the water, needs Check valves, some have them some don't.

make and model and we could tell.

could also be grit etc if the pipework wasn't flushed befroe the valve was fitted.

Title: Re: New combi - no hot water
Post by chtechie on Apr 7^th, 2005, 8:05pm

Called to a similar problem the other day - shower about a year old - boiler fine - plumber changed the seals and fitted a pressure reducer in the cold feed (he said he measured 7 bar incoming) - customer happy.

Title: Re: New combi - no hot water
Post by DavidG1305 on Apr 10^th, 2005, 3:29pm

Update :

Plumber fitted non return to hot side of shower.
We now have hot waer to all fittings but still a tepid shower. Its a 'bensham' thermostatic with a single control. Cartridge ?

Title: Re: New combi - no hot water
Post by PEDANTICVINDICTIVEMAN on Apr 10^th, 2005, 7:11pm

Jeez, another make I have never heard of, it's as bad as boilers, dont tell me they have been making "qaulity" showers since the ice age and supply to the whole universe, thats why we have never heard of them ???