Found 7th Oct 2009
Hi all,

Hoping someone can help with this:

We have hot water but radiators aren't getting hot. I've done a bit of googling and am fairly certain the Synchronous Motor has failed as if I wedge the valve on the Honeywell Sundial Y Plan 3 position diverter valve v4073a1039 open, the radiators get hot.

Now I'm guessing changing the whole valve will require draining of the system etc but will just changing the motor work? Will I not need to turn anything other than the electrics off for this? How simple is it? I've found the motor for about £12 delivered.

Any help would be appreciated as I don't want a plumber ripping me off if this is fairly simple.

Thanks

12 Comments

Will prob be the valve itself thats knackered and this is jamming the motor, system is easy to drain , you should have one or two radiators in the house with a drain connector, shut off your header tank and drain the system via a radiator using a hose going out the house. Change valve, then seal everything up and refill.


http://www.screwfix.com/sfd/i/cat/90/p1050790_l.jpg
^^^^^^
Connect hose here.

Some good info here.
diyfaq.org.uk/con…tml

Original Poster

esq3585;6511895

Will prob be the valve itself thats knackered and this is jamming the … Will prob be the valve itself thats knackered and this is jamming the motor, system is easy to drain , you should have one or two radiators in the house with a drain connector, shut off your header tank and drain the system via a radiator using a hose going out the house. Change valve, then seal everything up and refill.^^^^^^Connect hose here.Some good info here.http://www.diyfaq.org.uk/contents.html



Shut off header tank? Can I just do this at main stop cock?
Thanks for assistance, how much would you expect to pay for the entire valve?

There should be a stop valve either side of the Diverter.

MikeL;6512637

There should be a stop valve either side of the Diverter.



Last 2 houses I have been in only have the stop valves between the pump. :thumbsup:
None on the diverter valve.

publicnme;6512189

Shut off header tank? Can I just do this at main stop cock?Thanks for … Shut off header tank? Can I just do this at main stop cock?Thanks for assistance, how much would you expect to pay for the entire valve?



Yes if you shut off the main stop cock the header tank will eventually empty out. :thumbsup:
Not sure on a price for the valve, if you google the part number of the valve it should give you an idea. :thumbsup::thumbsup:

If you take the motor off the valve, held on with 4 screws, no need to drain the system for this or disconnect any wires. Turn the room thermostat and water tank thermostat up to make sure there is demand for water and heating. Put the programmer in water only setting and heating only setting and see if it moves. If not it's broken. Whilst the head is off the valve, make sure that that the valve turns by twisting it with pliers, a squirt of WD40 might help.

Original Poster

doberman;6512868

If you take the motor off the valve, held on with 4 screws, no need to … If you take the motor off the valve, held on with 4 screws, no need to drain the system for this or disconnect any wires. Turn the room thermostat and water tank thermostat up to make sure there is demand for water and heating. Put the programmer in water only setting and heating only setting and see if it moves. If not it's broken. Whilst the head is off the valve, make sure that that the valve turns by twisting it with pliers, a squirt of WD40 might help.



The programmer hasn't got a heating only setting as if the heating is on, the hot water has to be on.

Here's some pics of the setup if they can be of any further assistance?

picasaweb.google.com/pub…ing

If you can move the 3 way valve with the manual lever freely it can't be seized. LIke you said, the motor has gone. It is a simple job to replace, only 2 wires (I think). I had the exact same problem a couple of years ago and the replacing the motor fixed it.

10 minute job.

It does sound like it's the motor. No need to drain the water to replace it, just make sure that the electricity is isolated and make a note of the wiring before removing the old to copy when fitting the new.

dont you have to be a qualified electrician / plumber to undertake electrical work of this nature?

chocci;6516606

dont you have to be a qualified electrician / plumber to undertake … dont you have to be a qualified electrician / plumber to undertake electrical work of this nature?



No.

Do you still have probs mucker as me dad was/is plumber and can pop round with me to tell thee exactly whats up with it? let me know :thumbsup:
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