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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 9:29 am 
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Dave, does that valve allow for just the motor to be replaced??? I thought all valves had detachable motors these days??? Ayjay See https://www.youtube.com/watch?v=M9DkNwVL4Dc :thumbright:

DWD

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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 9:47 am 
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My posts keep going missing but I was about to say my 1st action would be to remove the actuator (4073 should) and make selections for water and heat only and see if the actuator moves (could be just a motor change) if it moves then lightly turn the valve stem with a small plier to perhaps free it of grud.
DWD is also onto this with the utube



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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 12:01 pm 
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I'll take a look at the vid - and then probably still phone the plumber. :mrgreen:

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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 5:56 pm 
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Power off and undo the small flat screw at the end.

You'll see 4 crosshead screws under the cover, a quick look under the valve will show which two go through to the base plate.

Undo them, it's quite safe because the metal case has a bump on it which tells us that you won't get wet. (If it didn't have the bump taking the screws out would let the H2O escape)

Wriggle the head off.

You'll see the spindle with two flats machined on it. See if it easily turns with a small wrench it only goes about 30 degrees or so. If it's stiff it's indeed a complete new valve.

I know you might not be brave enough but it will come in handy for someone :lol: :lol: :lol:

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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 6:02 pm 
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Just to add to Razor's helpful instructions:

If the spindle turns easily, the ball inside, which blocks the unwanted exit, may be leaking.

If the spindle is sticking, you can try using silicon lubricant where the shaft goes into the body (WD40 may rot the seals).

You can get a replacement ball and O-ring kit - part no 272752A/U CARD - price about £10. You need to drain down below the valve level; but it's cheaper than a new valve if the actuator is OK.



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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 6:17 pm 
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dewaltdisney wrote:
Dave, does that valve allow for just the motor to be replaced??? I thought all valves had detachable motors these days??? Ayjay See https://www.youtube.com/watch?v=M9DkNwVL4Dc :thumbright:

DWD


Yes DWD it does as long as there is a 'dimple' on top of the valve one end.

However this fault will need the complete valve replacing.

Basics, if heating wont come on but HW does, then either sychron motor or microswitch in head.

If heating comes on when it shouldn't, valve body letting by for some reason.

Also in the last scenario, the manual lever will not be fully back to the HW only position.

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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 6:58 pm 
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Ahh, I see, not as straightforward as I thought. I thought it was a simple case of changing the syncro motor.

DWD

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 Post subject: Re: Heating problem
PostPosted: Fri Jun 30, 2017 8:19 pm 
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Razor wrote:

I know you might not be brave enough but it will come in handy for someone :lol: :lol: :lol:


Challenging my manliness has almost talked me into it - :shock: - but, I emailed the plumber this afternoon, so I'll leave it to him. :lol:

I did say it wasn't urgent, so I might have get around to looking at it after the weekend if he's not got in touch by then, (but he's pretty good with that sort of thing).

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