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Old 12-10-2010, 12:18 AM   #1
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Zone Valve not working


Hi,
I am new here and I did peruse the site to find an answer to my problem..but struck out.

I have radiant in-floor heat with an indirect water heater. Last year Zone 4 quit working and I finally got around to looking at it. I finally figured out the front / removeable ahlf of the thermostat on the wall was not making good contact with the permanently (screwed to the wall) half of the thermostat. I fixed that by spreading the front half pins a little bit further aprat and now the thermostat is calling for heat. the green light is on. However, the red light will not come on. I took a meter downstairs to the Argo AZ-6P zone valve control box and found the following:
@ the switch behind the Honeywell zone valve: 2 red wires: meter on ACV 200 either 0 or 17.5v, depending on which lead is touchign which red wire..
@ the actuator: 2 yellow wires 19.1v or 26.4v depending on which lead touches which yellow wire

just the actuator removed: orange & yellow wires: Ohm 200 on meter: 23.6 or 23.6..no matter which kead touches which wire

with actuator connected to zone valve: orange & yellow wire: 6.7v, again no matter which lead touches the wires

Any thoughts as to why the red light will not come on? I actually had a 2nd Honeywell zone valve and swapped them out: i get the same above readings.

Even putting the switch in the manual position does not allow water to flow thru the pipes in the floor..

Thanks for the help.

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Old 12-10-2010, 01:02 AM   #2
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Zone Valve not working


Hi, I pulled the power head off completely and moved the valve spindle back & forth. It moves very easily about 45 degrees. But, which direction is open when looking straight at the valve spindle..the zone valve is mounted horizontally, facing into the room. I currently have it turned all the way to the left. I am guessing it is in the open position as the radiant pipes in the bedroom wall are now very hot to the touch....ouch. I will know int he morning if the floors have heated up. If they have, would that mean the powerhead, which is the actuator, is bad?


Last edited by asolarzone; 12-10-2010 at 01:05 AM.
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Old 12-10-2010, 04:45 AM   #3
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Zone Valve not working


What voltage do you read when you check across both yellow wires.
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Old 12-10-2010, 09:35 AM   #4
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Zone Valve not working


@ the actuator: 2 yellow wires 19.1v or 26.4v depending on which lead touches which yellow wire

@ the actuator means I disconnected the two yellow wires from the orange & yellow actuator wires
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Old 12-10-2010, 10:44 PM   #5
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Zone Valve not working


Hello? Is the voltage at the two yellow wires correct? Is the actuator appearing to be bad? Is it the switch? I hope you can help. Thanks.
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Old 12-11-2010, 11:08 AM   #6
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Zone Valve not working


Bump...bump....bump...I hope that guy who asked about the voltage is ok...he seems to have disappeared....can anyone else help? bump...bump
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Old 12-12-2010, 07:02 AM   #7
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Zone Valve not working


You need to read the voltage with the wires attached. And your probes need to be on both wires at the same time.

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