Honeywell 3 port diverter snag?

[John Armstrong]

G'Day fellers. Appreciate your help please:

When my boiler fires up it heats the water and radiators regardless of what is selected. I'm guessing that this means the valve is not moving from the de-energised position?

Its a Honeywell V4073A. The manual/auto lever moves freely both ways and will not latch in the man position. A test I found which involves turning the heating (only) on, holding the lever on manual then turning water on to check the valve motors across, did nothing.

A quick look under the cover shows the springs are OK and no sign of burning. The system was drained and refilled 6 years ago.

Over to you!

 

[Last Plumber]

G'Day fellers. Appreciate your help please:

When my boiler fires up it heats the water and radiators regardless of what is selected. I'm guessing that this means the valve is not moving from the de-energised position?

Its a Honeywell V4073A. The manual/auto lever moves freely both ways and will not latch in the man position. A test I found which involves turning the heating (only) on, holding the lever on manual then turning water on to check the valve motors did nothing.

A quick look under the cover shows the springs are OK and no sign of burning. The system was drained and refilled 6 years ago.

Over to you!

When you turn the power off at the Heating isolation, does it close?

How competent at Electrical work are you?
Do you have a multimeter and know how to use it?

 

[John Armstrong]

No it doesn't.
Basic but safe. I'd be happy to replace a powerhead or a synchronous motor
No I don’t.....

Here’s something that may be relevant:
All the pipes are now cool but the unit itself is still quite hot!

 

[Rob Foster]

I would wait until the cold weather has really gone ...then have a play , sounds like a new head. Rob Foster aka centralheatking

 

[Harvest Fields]

I would wait until the cold weather has really gone ...then have a play , sounds like a new head. Rob Foster aka centralheatking

2 hour job max if it is the whole valve Rob.

 

[John Armstrong]

2 hour job max if it is the whole valve Rob.

Sure, but the question is : Do I need to replace the whole valve with associated system drain?

 

[Riley]

Associated system drain? Are you asking if you can get away with just changing the head?? I would do the lot.

 

[Harvest Fields]

Sure, but the question is : Do I need to replace the whole valve with associated system drain?

Depends on the age of the valve?

 

[Old Account]

Sure, but the question is : Do I need to replace the whole valve with associated system drain?

Sometimes worth changing in full and perhaps replace like for like

 

[Last Plumber]

I would power off, test that it's off (pull a fuse and use a voltage tester). Remove the motor and check it over. They are normally fairly stiff to turn the cog beneath but will move. if it's jammed, replace it. They can be bought from DIY stores and are fairly cheap.
It could well be the head or valve but it is worth checking the condition of the motor first.

 

[John Armstrong]

Remove the motor and check it over. They are normally fairly stiff to turn the cog beneath but will move. if it's jammed, replace it.

Ok, so remove the motor and see if the spindle can rotate:

If it doesnt, buy a new one. If it does, assume a problem with the electrical supply?

Anyone worried by the housing being hot when the pipes are cold? Would this indicate a motor trying and failing to move the valve? Wouldnt this just burn out the motor?

 

[Last Plumber]

Ok, so remove the motor and see if the spindle can rotate:

If it doesnt, buy a new one. If it does, assume a problem with the electrical supply?

Anyone worried by the housing being hot when the pipes are cold? Would this indicate a motor trying and failing to move the valve? Wouldnt this just burn out the motor?

It will do that if the motor is stuck. Eventually it would burn out.

 

[Riley]

Hence I’d change the whole thing

 

[John Armstrong]

Hence I’d change the whole thing

But you’re a plumber!

 

[townfanjon]

2 hour job max if it is the whole valve Rob.

Oh I love a “ max” quote when you have never seen the job lol

 

[Riley]

But you’re a plumber!

You’ve said the motors hot I’d say it’s struggling to turn it hence I’d change it. I don’t say it for fun

 

[Old Account]

But you’re a plumber!

Perhaps you should get a decent plumber in to do the works for you.,

 

[fixitflav]

Wouldnt this just burn out the motor?

I don't think so. The earlier either/or valve (W-plan) definitely wouldn't, the motor stalled in the CH position, and it could stay that way all day. It dissipates about 5 watt in that condition.
I'm not 100% about the mid-position valve, but I think it probably does the same when CH only is calling. Wiring diagrams for both attached, if you want to try to work it out.

 

[John Armstrong]

Perhaps you should get a decent plumber in to do the works for you.,

That is the plan IF the valve is faulty.
Thats why I’m trying to diagnose first.
As mentioned, if its just the motor or powerhead, i could do it myself.

 

[Harvest Fields]

That is the plan IF the valve is faulty.
Thats why I’m trying to diagnose first.
As mentioned, if its just the motor or powerhead, i could do it myself.

If you are getting a pro in. There is no need to diagnose. He will do his own fault finding even if you tell him it is the valve.

 

[Last Plumber]

It might be best to get someone to look at it. A competent Heating Engineer will be able to diagnose the fault in a short time. It may be a wiring issue.

 

[Harvest Fields]

It might be best to get someone to look at it. A competent Heating Engineer will be able to diagnose the fault in a short time. It may be a wiring issue.

Let’s hope note. As we all know that we love sorting out other people’s wiring.

 

[Last Plumber]

Let’s hope note. As we all know that we love sorting out other people’s wiring.

Nothing worse is there.
I always completely disconnect everything from every Heating component and wiring box and start again. It's easier and quicker than trying to trace someone else's mess. Plus, once it's done I know its right.

 

[Harvest Fields]

Nothing worse is there.
I always completely disconnect everything from every Heating component and wiring box and start again. It's easier and quicker than trying to trace someone else's mess. Plus, once it's done I know its right.

The first time I had a wiring fault I spent 3 hours trying to trace it and got nowhere. Then decided to pull it all out and rewire. Complete and working in 30 minutes.

 

[Last Plumber]

The first time I had a wiring fault I spent 3 hours trying to trace it and got nowhere. Then decided to pull it all out and rewire. Complete and working in 30 minutes.

Always the best way. If there's any doubt, rip em out.