Honeywell Valve Not Working

[pufferfish91]

Hey folks,

I have a Nest thermostat which I would like to use the hot water function. The problem I am having is that when I select hot water, the Honeywell valve won't open. It has never actually worked since the system was installed about 6 months ago. I just left the valve open, but now we are approaching the hotter weather, I would very much like the option to just heat the water on demand rather than the entire house.

My electrician was out yesterday and did spot a dead cable in the Nest control box. He replaced this cable and tested all the other ones, so I don't think this is an electrical issue. I am leaning towards a DOA Honeywell valve. I was thinking of just buying a replacement motor to see if that worked as it seems an awful lot of hassle to get the whole valve replaced. I will likely have to get the entire system drained and pay a plumber to come out and fix it.
Before I try a new motor, is there any default setting on the valve, or on the thermostat that I am overlooking? I am using a Warmflow unvented heating system. Thanks all!

 

[Harvest Fields]

Which generation nest do you have? 2nd or 3rd? 2nd gen doesn’t support hot water unless the old programmer is left in situ. The 2nd gen only replaces the thermostat.

 

[Harvest Fields]

Also. Did we not instruct you about this before? Sound very familiar.

 

[pufferfish91]

Which generation nest do you have? 2nd or 3rd? 2nd gen doesn’t support hot water unless the old programmer is left in situ. The 2nd gen only replaces the thermostat.

It's a third gen Nest and it definitely does support hot water. Thanks.

 

[pufferfish91]

Also. Did we not instruct you about this before? Sound very familiar.

Haha good memory! The last post was that I couldn't get any hot water at all. Opening the valve sorted that. Secondly, my plumber advised at the time to get the wiring checked. I only did that recently because I was in no rush to get the hot water working without the heat. Now that the wiring has been checked and fixed, the valve still won't open.

 

[Chalked]

Need a new plumber and Electritian.
Both can determine if your problem is electric, or mechanical.

 

[Harvest Fields]

Haha good memory! The last post was that I couldn't get any hot water at all. Opening the valve sorted that. Secondly, my plumber advised at the time to get the wiring checked. I only did that recently because I was in no rush to get the hot water working without the heat. Now that the wiring has been checked and fixed, the valve still won't open.

If the nest is putting power to the valve and the valve isn’t opening then it is a new valve I’m afraid and I know you have disliked the post above but Chalked is right. Either of the 2 professionals you have had in so far should have been able to test what the faulty component was. He wasn’t being mean. Just trying to save you money in the long run.

 

[pufferfish91]

If the nest is putting power to the valve and the valve isn’t opening then it is a new valve I’m afraid and I know you have disliked the post above but Chalked is right. Either of the 2 professionals you have had in so far should have been able to test what the faulty component was. He wasn’t being mean. Just trying to save you money in the long run.

Thanks. I've ordered a new valve anyway.

I've removed my 'disagree' vote. I've known my electrician for years and I've no reason to doubt his competency. The plumber was just a rushed job which I'm disappointed with, so he's maybe half right.

I'll let you know how the new valve turns out. Thanks!

 

[heatservice]

Sorry but did no one check if there was power going to the valve motor itself with their multimeter ?

 

[pufferfish91]

Sorry but did no one check if there was power going to the valve motor itself with their multimeter ?

Yeah they did. I checked with my electrician today. I just thought of something. When I switch the hot water on, should the oil boiler not ignite at least? It isn't doing anything. The oil boiler only comes on if I switch the heat on. This is all very confusing. Thanks for the help!

 

[Harvest Fields]

Yeah they did. I checked with my electrician today. I just thought of something. When I switch the hot water on, should the oil boiler not ignite at least? It isn't doing anything. The oil boiler only comes on if I switch the heat on. This is all very confusing. Thanks for the help!

Nope

 

[heatservice]

Yeah they did. I checked with my electrician today. I just thought of something. When I switch the hot water on, should the oil boiler not ignite at least? It isn't doing anything. The oil boiler only comes on if I switch the heat on. This is all very confusing. Thanks for the help!

The boiler will only fire when at least one of your valves drive open and trigger the microswitch it looks like your HW valve is not doing that.

 

[ShaunCorbs]

Do you have any hot water at all or does it run cold ?

 

[Harvest Fields]

Do you have any hot water at all or does it run cold ?

He said it only gets hot when the lever is held in the open position mate.

 

[ShaunCorbs]

Might be the valve could be how it's wired to the unvented cylinder

 

[heatservice]

He said it only gets hot when the lever is held in the open position mate.

Holding the valve in the MAN position will not fire the boiler but your water will get hot when your heating is on.

 

[ShaunCorbs]

Holding the valve in the MAN position will not fire the boiler but your water will get hot when your heating is on.

It will fire the boiler / it should

 

[Harvest Fields]

Might be the valve could be how it's wired to the unvented cylinder

Fully agree mate. he also said he trusts his sparky and the electrics are sweet!😀

 

[heatservice]

It will fire the boiler / it should

It wont.

 

[ShaunCorbs]

It wont.

So the valve doesn't have a perm live going to the switch ?