Stumped by zone issue


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Old 12-13-18, 02:10 PM
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Stumped by zone issue

I have a zone (zone 2) devoted to my basement with baseboards. First two months of this season they worked great, I replaced the stat in the other zone (zone 1) with a Honeywell programmable and roughly a week later the heat in zone 2 stopped working.

Since it stopped working I've replaced the wiring to the thermostat, the thermostat itself with a newer, non programmable, and the zone valve motor. I can hold the end switch down and move the lever so the valve is open and my baseboards will heat. Zone 1 works as normal.

I'm completely stumped. Suggestions anyone?
 
  #2  
Old 12-13-18, 04:42 PM
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Do you have voltage (24-30v AC) in the ZV #2 circuit? If not, you might be looking at a blown transformer (this would assume your zone valves use separate transformers, since you say zone 1 works fine).
 
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Old 12-13-18, 05:59 PM
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What brand of ZV do you have. Are you saying if you put it on manual you get heat.

Try removing the stat and jump the stat wires together. If it works your problem is most likely in the stat. It's the only thing that operates the ZV, assuming you have 24V as was mentioned.

Not all stats are compatible with Taco ZV's.
 
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Old 12-13-18, 06:42 PM
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I jumped the wires and the zv won't operate, boiler still doesnt fire. Zv was a direct Honeywell replacement.

Haven't even seen trace volts to the zv circuit. Where would I look for the transformer?
 
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Old 12-13-18, 07:06 PM
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There should be a separate 24V transformer in the basement or on the boiler somewhere. It may look like a doorbell transformer but the wires go to the stat. You can check your breakers just in case.

It would be very unlikely though to have a separate transformer for each ZV.

Do you have a meter and know how to use it to test for 24V at the stat. Pics of your system would be very helpful if possible.
 
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Old 12-13-18, 09:02 PM
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Welcome to the forums.
How-to-insert-pictures
 
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Old 12-14-18, 03:20 PM
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Found the transformer inside the boiler housing. Followed the wires and realized the person who installed had the thermostats connected to the wrong zones. It's now looking like the end switch for the zone which wouldnt turn on is defective. Ordered a new switch and will see if my solder/install job is the fix.
 
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Old 12-14-18, 03:27 PM
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A,
If you have a gas boiler that transformer you found may be just for the boiler controls and should not be used to power the zone valves. There should be a separate trans. for the zone valve circuit.

Pics would be helpful to see what you have unless you're sure it's the right one.
 
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Old 12-14-18, 03:36 PM
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Hmmm...... usually the one inside the boiler is for the boiler control itself.
 
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Old 12-14-18, 03:46 PM
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Pete. That's what I meant. Sometime I say boiler and sometime burner but I changed mine so nobody gets confused. Thanks.

My point was though, he shouldn't be using it for the zone valves.
 
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Old 12-14-18, 03:52 PM
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I didn't see your reply spott. We're both discussing the same transformer.
The one for the zone valves may be hidden. Possibly connected to a box in the ceiling.
 
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Old 12-24-18, 01:43 PM
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New end switch fixed the problem
 
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Old 12-24-18, 02:17 PM
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A,
Thanks for the update.

Merry Christmas!!
 
 

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