Combi boiler, no HW upstairs only

[GasmanxxxR1]

I mainly do installs but a good friend of mine called with the above symptoms. Any ideas as to what i should look out for?

Many thanks

 

[diamondgas]

Stretched diaphragm on the hot water flow valve, reduced flow, filter blockage. That sort of thing 🙂 Sounds like its detecting flow but not all. If it's the shower then that can be different all together 🙂

 

[GasmanxxxR1]

Yes they said the shower was the first thing they noticed, any ideas, thanksdiamond gas

 

[CES]

Are they getting HW at other outlets (i.e. Kitchen), Are they getting water at all upstairs? If its just upstairs affected its probably a pipework/tap issue.

 

[GasmanxxxR1]

They said upstairs only is affected, wife said shower, husband said all the hw outlets upstairs

 

[CES]

its one of those jobs you would have to see for yourself in order to diagnose it. Sounds more like a plumbing problem than a boiler problem IMO.

 

[diamondgas]

Most likely stretched diaphragm ... Do you know what boiler it is? The shower stat cartridge is possible but I'd want to eliminate the boiler TBh much cheaper 🙂

 

[GasmanxxxR1]

Thanks for the great advice. How does the stretched diaphragm cause those symptoms?

Must go on that fault finding course

 

[diamondgas]

Certain flow rate required to produce the pressure diff to lift the diaphragm. As it stretches it takes a greater diff to lift the valve. Upstairs will have a lower flow rate than downstairs, shower even less! Eventually the stretching will get to a point where the lower requests will be ignored. Usually shower then upstairs basin....!

Does that make sense?

 

[GasmanxxxR1]

Yes, thats brilliant diamond gas. When i get stuck into it, i love fault finding. Its just been years since had to fault find on a boiler. I now mostly fit new and fault find on the system, if you know what i mean

I really do need to go on a refresher course and earn some money this way...

Any courses to recommend?

 

[diamondgas]

It all depends if it's a boiler with a diaphragm valve to be honest mate! Kind of important to know the boiler to give a more accurate probability! I wouldn't know of any training courses TBH 🙂

 

[stevetheplumber]

Yes, thats brilliant diamond gas. When i get stuck into it, i love fault finding. Its just been years since had to fault find on a boiler. I now mostly fit new and fault find on the system, if you know what i mean

I really do need to go on a refresher course and earn some money this way...

Any courses to recommend?

baxi three day course includes using a multimeter properly