Heil: what makes the heat stay on..... - http://www.hvacmechanic.com/ Forums
Original message
| dcobb
 |  "Heil: what makes the heat stay on....."
, posted Tue 6 May 19:28  
My elderly mother has a Heil central a/c unit. we replaced the thermostat. The heat stays on even in a/c mode.. Can anyone tell me why? Is it a relay or something else? The blower comes on But only the heat comes out...
Dawn Cobb
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Replies:
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| theduke03
| "Re(1):Heil: what makes the heat stay on....." , posted Tue 6 May 19:40
Is this before or after you replaced stat?
"My dad was the most feared furnace fighter in Northern Indiana."
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| | dcobb
| "Re(2):Heil: what makes the heat stay on....." , posted Tue 6 May 19:44
both. we replaced the therm, with a jumper and without. my husband can manually (outside) start the compressor but the button does not stay down. (he's pushing a button on the "contactor"?
Dawn Cobb
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| | theduke03
| "Re(3):Heil: what makes the heat stay on....." , posted Tue 6 May 19:56
If heat is running and stat is not in heat mode, calling for heat then there is a short in the system somewhere. Be careful with that contactor,230v kills and hurts too.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | dcobb
| "Re(4):Heil: what makes the heat stay on....." , posted Tue 6 May 20:03
what would be not allowing the compressor to click on outside? but we can do it manually. Maybe a relay of some sort???
Dawn Cobb
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| | dcobb
| "Re(4):Heil: what makes the heat stay on....." , posted Tue 6 May 20:00
My husband is an electrician so I definately know about the volts!! :) could the contactor be bad? would this make the heat stay on/not allow the compressor to come on?
Dawn Cobb
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| | theduke03
| "Re(5):Heil: what makes the heat stay on....." , posted Tue 6 May 20:09
Ok I will deal with you folks but only cuz u said your husband is an electrician. First of all you have two separate problems.
1: Tell Hubby to disconnect stat wires at both ends and check from each to each for ohms. All should read open or infinate. Any two wires with 0 or measurable ohms are shorted and NG. What type of heat is this?
What is make and model of new stat?
Could have wrong stat or be miswired.
2:Check for 24v at outdoor unit Y and C (usually the only two low voltage wires.
3: Report said findings back here.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | dcobb
| "Re(6):Heil: what makes the heat stay on....." , posted Thu 12 Jun 11:28
Well we replaced the contactor, no use. it still blows very hot air and compressor does not come on. Could it be low on refridgerant????
Dawn Cobb
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