Main Combi 24 HE Hot Water Luke Warm Following Water Being Cut-Off

[Magic]

Hi All,

I'm new here so thanks in advance for any help

I have a Main Combi 24 HE running on propane in a mobile home. I moved into the home in March and was told that the boiler was just a few months old, it certainly looks all clean and sparkly and has always worked well enough that I can run a little cold with the hot fully open to get a nice hot bath.

I am an electrician with a good understanding of plumbing, just not combi boilers! So, here goes......

Last week my water supply was disconnected without warning, at the time I was running a bath and my washing machine was on. Since then my hot water is only coming out luke warm. My central heating works okay, although I do think that it is a little slower to heat the rads but I'm not 100% about this.

Also, there is a noise a little like a rattlesnake when hot water is being called for. This appears to be coming from the plate heat exchanger, but again I'm not 100% about this. There is no noise when the central heating is on.

If I restrict the flow at the hot tap the water does get a little hotter, enough to bath in but only just and next month the water going in will be colder.

If I turn down the temperature dial on the front of the boiler then the flames do drop and return to what appears to be 'full-blast' when I turn it up again.

I have drained the boiler down a couple of times, hot water side only, but this has not changed anything. So, does anyone have any suggestions?

Many thanks for reading my plea

 

[Dotty]

People should be shot for using imperial.

12 gauge?

 

[Magic]

Okay, I'm loving the side conversations here lol.

But about my problem again......

If there is some crap in the heat exchanger then wouldn't that have the same affect as restricting the flow? i.e. less water coming through but it would be hotter?

When the hot is on then the flow is a bit 'up and down', if that's another good clue.

Liking the chat guys

:yesnod:​

 

[solutions]

12 gauge?

BANG.... No 9mm!

 

[solutions]

Okay, I'm loving the side conversations here lol.

But about my problem again......

If there is some crap in the heat exchanger then wouldn't that have the same affect as restricting the flow? i.e. less water coming through but it would be hotter?

When the hot is on then the flow is a bit 'up and down', if that's another good clue.

Liking the chat guys

:yesnod:​

There are some things that spring to mind I would check but the advise would be of the kind I can only share with other gas safe in the non public forum. But suffice to say that your understanding that any blockage would reduce flow is logical but the reduced flow may be almost un noticeable. Call a local GSR. If you have the means to measure the flow and temperature of the hot water the Main is putting out, as has been suggested it will be clear if it is underperforming.

 

[chris watkins]

I've never seen them for years! I loved them when i still had teeth :lol:

It's because you loved em that you have no teeth !!! :lol:

 

[Ermintrude]

It is a strange one Chris. I think weights will come first as the younger ones don't really know lb and oz and have no real reason to use them.
Pints and gallons may be next but feet and inches and miles will probably last for another generation at least but only some units. Most don't know what a yard is or how many yards are in a mile never mind how many chains are in a furlong :lol:
The same could be said for some SI units. No one uses deciliters or my favourite waste of time the decimeter.

U live in a posh area then. When I was a student learned all about 1/8ths and Oz

 

[chris watkins]

U live in a posh area then. When I was a student learned all about 1/8ths and Oz

We no, hence the Magic Round About fixation, a Ermi !!!:smoking: