Cannot use heating and hot water separately!?!?!?

[lucyjacobs83]

Hi All,

I am getting really frustrated with my CH and HW system. If you select either hot water OR central heating nothing happens. If you press both then it comes on. This might not be as much of a problem, but after an hour (when the water is fully heated) the whole system switches off. It then wont go back on until you use some of the hot water, or it cools down. Please can someone let me know what the problem is likely to be?

Many Thanks Lucy x

 

[Registered Gas Man]

Three port valve. Silver possibly blue or white valve in your airing cupboard won't move into the heating only postion.

 

[kevindgas]

left a message in your profile - kev

 

[lucyjacobs83]

I can't move it at all, it seems to stay in the middle whatever is happening. I played around with the hw an ch on off buttons, the hw controls it all. The ch does nothing. Here is a picture of the sodding thing!

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[gas4you]

May just need the valve head, if you can get these seperate on this valve

 

[lucyjacobs83]

Hi Dave, I'm possibly just being a complete fool, but, which valve is it that you think is faulty? Is it the mid-position valve? Thanks for your help!

 

[kittedup]

First thing first...

Has it always done this or has it just started?

Ted

 

[AfterburN003]

the mid position valve. Its the white thing above the red pump. The lever on the side can be moved manually to give u hot water/heating. It looks possibly like a Myson one. If it is you can just swap the headwithout draining the heating system.

 

[kittedup]

That's a drayton valve.

To test it out turn off the switch off on the left of the programmer. The indicator on the 3 port valve should go to W. If it doesn't feel around the right hand side of the valve for a black tab. Flick this out with your thumb and it should return to W.

Turn the power back on and then have a go at selecting HW only. The boiler should fire straight away.

Ted

 

[lucyjacobs83]

Hi Ted,

I've tried doing what you said but the little lever in the mid position valve doesn't move, it just stays dead centre. Also selecting HW always fires the boiler, which starts the CH & HW. It's when you select CH it does nothing, sorry to be a pain.

Lucy x

 

[kittedup]

the little lever in the mid position valve doesn't move, it just stays dead centre.

Did you try the black tab on the right hand side of the valve?

It sort of flicks out and across at the same time.

Ted

 

[lucyjacobs83]

Hi Ted, had another go and managed to get it switched to W but wont switch to H. When it is switched to W it does not seem any different to when it's switched to M?

 

[kittedup]

What happens to the indicator on the valve when you select heating only on the programmer?

The next steps in identifying which part of your system isn't working correctly will need you to use an electrical tester to see which wires you have power on.

If you are not confident in doing that you are gonna have to get a plumber/RGI in. Anyone you get in who knows their stuff should be able to identify the problem in about a minute.

Ted