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The furnace A coil freezes up at times with the ac on durning heat temptures outside of 95-100 degrees

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Call a serviceman and have them add freon. You may also want them to check for leaks.

Posted on Sep 04, 2010


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Questions about a dual energy heating furnace

If you have a heat pump the electric heat is the emergency heat. Short explanation of a heat pump is it switches the jobs of the indoor and outdoor coils. So instead of taking heat from inside and moving it outside it works backwards picking up heat from outside and moving it indoors. Probably an electrical problem. 7_7_2014_5_33_51_pm.png

Mar 14, 2014 | Heating & Cooling

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Model Number: UACC-036JAS The unit works fine. The problem is it doesn't shut down after the specified temperature has been reached. The furnace blower shuts down, but the ac unit keeps on running....

Hello, usually a stuck contactor coil will cause this on the outside unit. When the outdoor unit runs continously and the indoor blower does not run no heat is being absoebed by the evaporator coil and thus the line freezes. Replaceing the contactor will fix the problem.

Aug 30, 2011 | Ruud Heating & Cooling

1 Answer

Airflow from Air conditioner is low how do i fix it.

Airflow from your air conditioner can be low for a number of reasons, if would greatly help if you had said whether it was a window unit or a furnace/ac type of split system. That being said, here are a few places worth looking.

1) AIR FILTER - if you have a furnace, this will be inline with any duct work. If you have a window unit, the filter will usually pop out from the front(usually these are a nylon mesh and can be washed in the kitchen sink). If you have the former furnace based air filter these are replaceable in most cases and can be bought at any hardware store and sometimes walmart.

2) EVAPORATOR FAN MOTOR - Your evaporator fan motor may have something caught around the shaft, or the blades may have broken. A lot of window units use plastic fan blades, and they do on occasion break. In the case of a home furnace/ac you have a blower wheel, or "squirrel cage", these blades are usually metal and can rust out over long periods of time without proper care. If you have a belt drive motor, the belts may need to be tightened, or changed. A belt drive motor would be very rare in a residential application.

3) EVAPORATOR COIL ICING UP (FREEZING) - The evaporator coil is the portion of the system which absorbs heat (it is later rejected outside or in a more desirable area by the condenser coil). This coil gets cold, usually about 40 degrees F to provide you with 55 degree discharge air. At times, and for a number of different reasons, it is possible for a coil to "freeze", or "ice up". This can be caused by dirty air filters, or bad fan motors/blades, not to mention low refrigerant charge and a host of other problems. If this is your issue, deice the coil, and restore power to the unit. Especially if you have a basic unit with no frills, if left on long enough in a cool enough room with high humidity, a coil can accumulate sufficient ice to lower air flow. Air conditioners of the residential type have no defrost cycle. They instead utilize "off cycle" defrost, meaning that the coil will defrost whenever the unit is not calling for cooling. So it is easy to see if left on for too long you can have problems from this.

1 and 2 are easy to check, 3 may not be so easy. The evaporator is an A-coil and named so for its shape, it will be located the furnace, and you will have to remove a few panels in order to see it in most cases. In a window unit, remove the air filter to gain visual access to the evaporator coil.

I hope this helps, I wish I knew what type of system you were using.

Jul 12, 2011 | Heating & Cooling

1 Answer

The outside unit of my Carrier Air Conditioner/Model # 38TG030300 is freezing up the line going to the unit inside.

Is it freezing up at a drier or just a section of tubing? More info would be good. If the line is frosting up all the way back from the indoor to the out door coil, and I guess that we are talking about the suction line, the larger of the two. My guess it either the stat. is set to low below 72 degrees and or the indoor coil is dirty or the filter is. Clean the indoor coil be careful to not get water else where such as into the furnace take appropriate steps to prevent it. All AC units have to have 400 cfm of air flow for each ton of cooling if the do not have this they will freeze up, vents closed off will do the same as a dirty coil.

Jul 02, 2011 | Heating & Cooling

1 Answer

I have two heatpumps up and downstairs and two furnaces (piigy back). At times my pump outside freezes up and cold air blows in the house. I was told that I needed a kit to tell my furnace to turn on when...

A couple of things... First your furnace should be 2nd stage on a 2 stage thermostat and if the heat pump don't keep up your furnace should be coming on anyway...If you get a Honeywell Vision Pro 8000 series thermostat for 2 stage heat pump operation and an outdoor sensor, you can have the thermostat shut down the heat pump and start the furnace at what ever temperature you decide...

Secondly, you have a problem with the defrost cycle on your heat pump(s) If they are frosting up that bad at 40 degrees than the defrost is not working on them. If they are hookup up right, every fours hours or so they will go into A/C mode and heat the oudoor coil up to melt the ice off of them. The furnace should be heating while that is happening. Sounds like they really don't know what they are doing when it comes to heat pumps...

I hope that this will help you to solve your problem!

Thanks for using Fixya!!


Dec 16, 2009 | Heating & Cooling

1 Answer

Dometic a/c on fifth wheel with comfort controls

First lets address the heating issue. These are not furnaces but are known as "Chill Chasers" and are not designed to "heat" your RV Attempting to use them as a whole coach heater will burn them up in short order.

Your A/C sounds like the coils are freezing up. There is a small probe that is placed into the coils. you can see it from under the unit if you remove the interior cover - a little 1/8" in dia. silver piece flattened on one end to slide between the coil fins with a wire going back to the control box
It may have fallen out

Sep 29, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Why does my AC keep freezing (Carrier FB4ANF036). I have replaced the blower motor less than a month ago due to the same problem. Just last night we had a lightening storm and shortly after that the AC...

if your system is a heat pump you can switch to heat and see if coil outside gets cold while indoor blows warm air - then switch back to a/c - both coils should not be cold at the same time - low freon pressure / dirty coil / dirty filter / low air flow causes freezing

Sep 22, 2009 | Carrier Heating & Cooling

1 Answer

AC unit dripping water and won't cool

The coil is likely froze up due to dirty evaporator plugged ,air filter or low on freon .Tom

Jun 18, 2009 | Heating & Cooling

1 Answer

Goodman furnace

double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again

Jun 02, 2009 | Goodman GMS90703BXA Heater

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