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Old 10-12-2011, 06:28 PM   #1
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Indoor coil is hot when unit is off....


I have a HEIL unit, not sure of the actual model, but the mfr # is HAC036AKA1.

The indoor coil (I guess it's called the evaporator coil) has frozen a couple times this summer, but moreso because I was using filters that were too thick. I downgraded to a cheaper grade filter, and it froze once more a couple weeks ago.

I turned the unit off and let it thaw (I helped it out a little with a hair dryer), and it seemed to work fine after that.

The last few days I have noticed that the evap coil sits unusually hot when the unit is even completely off.

Any ideas? I rent this house, and everytime we've had a problem the last couple years, our landlady usually sends her maintenance guy out to check it, instead of a licensed HVAC service contractor.

I'd really like to know what the heck is going on so she doesn't give me the runaround yet again.

TIA.

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Old 10-12-2011, 06:58 PM   #2
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Indoor coil is hot when unit is off....


Is this a gas furnace, or a heat pump?

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Old 10-12-2011, 07:07 PM   #3
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Indoor coil is hot when unit is off....


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Originally Posted by Master of Cold View Post
Is this a gas furnace, or a heat pump?
It's electric, so I'm guessing it's a heat pump.
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Old 10-12-2011, 07:08 PM   #4
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Indoor coil is hot when unit is off....


So when you say evaporator, are you referring to just the coil, or the entire cabinet?
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Old 10-12-2011, 08:49 PM   #5
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Indoor coil is hot when unit is off....


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So when you say evaporator, are you referring to just the coil, or the entire cabinet?
The coil. Cabinet underneath feels relatively normal.
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Old 10-12-2011, 11:11 PM   #6
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Indoor coil is hot when unit is off....


Where is the evaporator located in the home, basement, closet or attic?

Btw, just because you have electric heat does not mean you have a heat pump, it means you have electric heat strips in an air handler. Not saying you don't have a heat pump (we'd need the make and model of your outside unit to be certain) as gas or electric could be secondary heat...
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Old 10-12-2011, 11:13 PM   #7
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Indoor coil is hot when unit is off....


Are we talking the inside evporator coil? If so then you'd literally have to open up or remove the panels of said coil/air handler to even get to the coil and I'm not sure why you'd be doing that, just to touch it I mean.
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Old 10-12-2011, 11:17 PM   #8
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Indoor coil is hot when unit is off....


It sounds like the electric heat is on.
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Old 10-12-2011, 11:36 PM   #9
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Indoor coil is hot when unit is off....


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Originally Posted by Doc Holliday View Post
Where is the evaporator located in the home, basement, closet or attic?

Btw, just because you have electric heat does not mean you have a heat pump, it means you have electric heat strips in an air handler. Not saying you don't have a heat pump (we'd need the make and model of your outside unit to be certain) as gas or electric could be secondary heat...
It is in the laundry room.

BTW...totally forgot... I did call an HVAC guy today for pointers , and without much help, he did say that based on the 1st 3 letters in the model #, it is not a heat pump, but an A/C with heat strips.

Make/ model are in my OP.
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Old 10-12-2011, 11:42 PM   #10
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Indoor coil is hot when unit is off....


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It sounds like the electric heat is on.
Hmm... I did turn the heat on about a week ago when it got down into the 40s one morning.

Could it be the thermostat, or the heat strips stuck?
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Old 10-13-2011, 03:47 AM   #11
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Indoor coil is hot when unit is off....


Ok, I just thought of something.

I'm a real novice here, so I don't know the part, but it seems like I remember something I googled last night mentioning some sort of heating mechanism that keeps the coils from freezing over. What is that thing called? Because, it's fine when the A/C is running-normal temp. And, the A/C puts out pretty cool.

Only when it's off does it heat up like it does.

The other semi-helpful thing that the HVAC guy I called told me was that if the heat strips are stuck, then my power meter outside would show rapid usage.

So, I checked my meter with the heater off, and the meter's usage bar (digital meter) cycled very slowly, indicating minimal power consumption from lights and a TV. But, when I turned my heater on, the thing cycled much more quickly, showing increased power consumption.

So, I'm not really sure if the heat strips are the problem. If the heat/heat strips was/were on, it would show more power consumption on the meter than it does.

BTW, to answer a previous question, the coils are easily reached from the main return vent on my unit.

Last edited by sgt. osiris; 10-13-2011 at 03:50 AM.
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Old 10-13-2011, 07:45 PM   #12
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Indoor coil is hot when unit is off....


Do you have a voltage meter?
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Old 10-13-2011, 08:07 PM   #13
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Indoor coil is hot when unit is off....


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Do you have a voltage meter?
As in, a multimeter? Yes.
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Old 10-15-2011, 08:10 PM   #14
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Indoor coil is hot when unit is off....


Do you know how to tell the size of the heat strip?
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Old 10-15-2011, 10:28 PM   #15
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Indoor coil is hot when unit is off....


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Do you know how to tell the size of the heat strip?
No clue..

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