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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> water going from hot to not so hot https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1211836824 Message started by herby on May 26^th, 2008, 10:20pm

Title: water going from hot to not so hot
Post by herby on May 26^th, 2008, 10:20pm

Hi everyone just new at this and i wonder can anyone please help me.I have a baxi 105e and had a plumber out fixing it i had a hot water led light flashing and he replaced the switch which it solved., but when i turn the hot water on to get a shower the hot water only stays on for a while and then goes cold not really cold but not as warm as it should be i have the temp switch turned up but there must be another fault. Please can anyone help :'(

Title: Re: water going from hot to not so hot
Post by lovejoy on May 27^th, 2008, 6:14am

look at the boiler while the shower or a tap runs / err try both dose it light and go to full flame then got to minimum flame or go out without a flame faliure light flashing ?

Title: Re: water going from hot to not so hot
Post by herby on May 27^th, 2008, 6:59pm

When the water is turned on the flame light comes on and the boiler fires up, when i lower the pressure of the tap the flame still on but lower. The plumber tried this he also had them both running the shower and the tap but still the water is not that hot. Before you couldn't touch the water because it was so warm.

Title: Re: water going from hot to not so hot
Post by thescruff on May 27^th, 2008, 8:46pm

Whats the temperature like at the kitchen sink and basin, it sounds more like a shower problem to me.

Is the rose clean (the little holes)

Title: Re: water going from hot to not so hot
Post by herby on May 27^th, 2008, 10:42pm

The water at the sink starts of really warm then goes lukewarm its the same in the shower and sink.

Title: Re: water going from hot to not so hot
Post by herby on May 27^th, 2008, 10:50pm

There must be a similar fault in these Baxie 105 this only started to happen when my hot water led light started to flash. the plumber replaced the switch and cured this fault but the hot water was never as warm. Could it be a build up of limescale in the dhw heat exchanger.

Title: Re: water going from hot to not so hot
Post by lovejoy on May 28^th, 2008, 1:00pm

it could be that or the ntc sensor try changing that first is the cheapest option

Title: Re: water going from hot to not so hot
Post by herby on May 28^th, 2008, 7:04pm

Cheers lovejoy i will try this and let you know. Is this the only 2 things that it could be??? and if it is the heat exchanger could anyone tell me how much it would cost me to get it fitted labour as well cheers. I have a Baxie combi 105e instant. It not the ntc senor because the plumber replaced that so it must be the heat exchanger.

Title: Re: water going from hot to not so hot
Post by lovejoy on May 29^th, 2008, 10:38am

yes sounds like it will be 1 of the 2 heat ex is around £60 cannot comment on labour charge as of course areas differ

Title: Re: water going from hot to not so hot
Post by herby on May 29^th, 2008, 10:27pm

Cheers to everyone who has replied to my questions much appreciated.