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Carrier transicold tm900, remove evap cools below set

Carrier tm900, remove evap cools below set point,have voltage to heaters,heaters work when i pull down drain pan to inspect.When i install drain pan then restart.Remote evap cools heaters dont seem to do anything.

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Posted on Dec 15, 2009

  • Dan Webster
    Dan Webster Dec 16, 2009

    When you restart the heaters ain't gonna do anything unless you are in a subzero climate and need to keep the contents above the freezing zone. It is all automatic. Keep your setpoints at the temp you want the food. Keep the fuel tanks full.



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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Code a27 on carrier unit

AL27 A/D Accuracy Failure

The Controller has a built-in Analog to Digital (A-D) converter, used to convert
analog readings (i.e. temperature sensors, current sensors, etc.) to digital readings.
The Controller continuously performs calibration tests on the A-D converter.
If the A-D converter fails to calibrate for 30 consecutive seconds, this alarm is activated.This alarm will be inactivated as soon as the A-D converter calibrates.

Aug 07, 2018 | Carrier Heating & Cooling

1 Answer

Carrier. Will not go below 55. It's hot in here

Carrier units are not designed to go below 68 degrees set point. Any lower and you will freeze up the coil. Once the coil thaws out air flow is resumed and you can try to cool your room

Jul 12, 2018 | Heating & Cooling

1 Answer

How do I turn heater off. Its 80 degrees out. And will I be able to turn back on when needed?

lower thermostat set point. and you can put it any temp you wish. heater below set point runs heater ave set point is off

May 04, 2018 | Heating & Cooling

1 Answer


I can find no A27 fault code for this unit, what is it doing? You can call carrier and ask for the definition, I think they will give it to you, just have the specific model number in hand when you contact them.

Aug 18, 2016 | Carrier Transicold Division Heat/cool...

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Heater blowing cool air

Is it set on summer switch which is the fan running all the time blowing cold air

Feb 15, 2012 | Heating & Cooling

1 Answer

I need an operation manual for a carrier transicold supra 644

You can order a manual at the following link;
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Oct 29, 2011 | Heating & Cooling

1 Answer

2001 Audi A4 heater blows cool air even when set on Hi. When I park water drips from AC condenser like I was using air conditioning

The EVAP core (the part that cools the air) is similar to a dehumidifier. As the outside air passes through the EVAP core it removes the moisture from the air. The moisture collects on the EVAP core and eventually drains out of the EVAP drain which is usually under the passenger side of the car. This is normal any time the a/c is on.

I’m happy to assist further over the phone at

Oct 06, 2010 | Audi A4 Cars & Trucks

1 Answer

GE side by side GSS20IEP Refrigerator freezer freezing

this is a problem that is no stranger to most GE side by sides; GE has used a glass type defrost heater in the freezer which often fails. If you manually defrost your appliance (unplug and leave doors open for 24 hrs) then plug back in, it will appear to work normally for a few days and gradually build up frost on the evap panel (back panel in the freezer) and eventually the refrigerator side will seem to loose cooling due to frosted damper, or lack of cold air transfer over the evap coil. The fix for this is to replace the defrost heaters (s). While not as common, defrost thermostats can open causing the unit to skip defrost, and even less likely is the defrost control (either mechanical timer or adaptive defrost). First, defrost your appliance, then remove the evap panel and ohm out the heater(s), if open, replace. If they check ok, check your defrost thermostat (small disc like object attached by a clip on the evap. coil itself) for signs of popping open or open ohm readings at normally closed temperatures. Its a good idea to change this anyway when replacing defrost heaters as the two work hand in hand. Last, check the defrost timer by manually advancing the screw advance clockwise until you hear the first click, then check voltage to the defrost heater and thermostat, if no voltage present replace timer. If your appliance is equipped with a adaptive defrost board, refer to the schematic for proper diagnostics.

Jun 11, 2009 | GE GSS20IEP Side by Side Refrigerator

1 Answer

Carrier split 42G250HF-1(indoor unit

I'm not sure exactly what unit you have and what controls you have installed on the unit. But....there usually is a flash code schematic on the unit. Usually on the inside of the blower compartment cover. This should tell you what is wrong with the unit. It could have a low voltage short somewhere and is loosing the call for cool. So the answer can be a possible yes to your question but without knowing the flash code, it's hard to tell from my point of view. You might end up calling a service professional out to check it.

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2 Answers

Carrier home ac system

sounds like your contactor is stuck closed.This is the part that high voltage connects to and lets power through to the compressor and condenser fan motor when you get a call for cooling.If you go to pull it out,kill the power outside AND at the furnace.

Aug 12, 2008 | Carrier Heating & Cooling

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