Shower going from hot to cold - Main Combi 24 Boiler

[handywomaneve]

Hey everyone,

I'm hoping for some help/advice with my shower. I've a Main Combi 24 boiler, and my shower is from a mixer tap over the bath.

When the boiler flame lights, the shower will be hot almost instantly, but a few minutes into the shower it'll go completely ice cold. I'm then soaped up and stood there hopelessly waiting for it to return to hot, which it does after a couple of minutes.

Any ideas out there about how I could fix this/what issue I'm looking at?

I appreciate any and all help.

Eve

 

[ShaunCorbs]

Does it do the same with the kitchen hot tap ?

 

[handywomaneve]

Thank you for the reply. Yes, it does do the same with the kitchen hot tap!

Thanks,

Eve

 

[ShaunCorbs]

Best to get a gas safe engy out

 

[townfanjon]

Shaun above is a man if few words , you need a gas safe registered engineer to look at the boiler.

 

[SimonG]

Shaun above is a man if few words , you need a gas safe registered engineer to look at the boiler.

But not fewer than 5

 

[rpm]

But not fewer than 5

*WINNER*
(Damn it, have to say more!)

 

[Burger]

Hey everyone,

I'm hoping for some help/advice with my shower. I've a Main Combi 24 boiler, and my shower is from a mixer tap over the bath.

When the boiler flame lights, the shower will be hot almost instantly, but a few minutes into the shower it'll go completely ice cold. I'm then soaped up and stood there hopelessly waiting for it to return to hot, which it does after a couple of minutes.

Any ideas out there about how I could fix this/what issue I'm looking at?

I appreciate any and all help.

Eve

Any recent modifications in the property?

 

[centralheatking]

If this has always happened then its the cold water pressure over powering the hot....you will need different taps. If it is recent fault on boiler....either way get engineer out, do it soon as autumn is coming and all the good ones will be busy. centralheatking

 

[king of pipes]

If this has always happened then its the cold water pressure over powering the hot....you will need different taps. If it is recent fault on boiler....either way get engineer out, do it soon as autumn is coming and all the good ones will be busy. centralheatking

I guarantee it wont be that bud the hot and cold water pressure are equal on a combi , its more likely to be a plate heat exchanger restriction and as my fellow engineers have stated it needs a GSI to attend to sort the problem out. Kop

 

[steve131]

Hi. I have much the same problem with my shower which is fed by a Baxi instant 105e but it only goes cold on the shower. All the taps run fine.
I'm trying to get my head round what you say about the hot and cold feeds being equal pressure. As far as I can see my combi doesn't feed cold water. The cold feed is from the main and doesn't feed from the boiler. Am I missing something here?!
Perhaps the later boilers do this? Thanks. Steve

 

[SimonG]

Check filters. Swap cartridge.

Hot from a combi is as close as you will get to equal pressure with your cold.

 

[steve131]

Thanks for the reply. The boiler man from Brit Gas has been twice and passed the boiler as all good. He said change the thermo mixer which is a bar type. I've changed that and the problem is still there. I was really careful to choose a mixer that copes with low pressure as the water pressure is pretty low here. I also have a water softener that has been a really worthwhile addition about five years ago.
I've had a good trawl through all the different threads here that relate to this problem and it would look like there's a lot of it about. Also, nobody ever reports back with any results, go or bad.
I'm going to maybe change the pipe routing to get optimum flow to the mixer but it does look like I'm on a looser as this shower has been working perfectly since 2005 and all of a sudden, it doesn't.
Can someone recommend a decent electric shower unit?! Thanks. Steve