Question about GE Zoneline AZ25E12D3B Air Conditioner

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I have a GE ptac zoneline 4000 that wont heat on resistance but will on heat pump. It will heat when the unit has been off and the temp is below 40 f. after it has been on for 5 minutes the heat goes off but the heat pump keeps going. Checked all sensors and they all read about the same 6 k. If i put ice on the room air sensor the resistance heat comes on so I changed the sensor but, the same problem continues. This unit was made about 1994. Help Paul

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Posted on Jan 02, 2017

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SOURCE: Problem with GE Zoneline 5200 model

Heat pumps have saftey circuits that prevent liquid flooding of the compressor. Inadequate airflow across the evaporator in cooling can trip this circuit. Have your package unit serviced with particular attention to cleaning the evaporator coil and be sure your filters are clean and changed frequently in the summer months. Hope this helps GL!

Posted on Jun 08, 2008

  • 2 Answers

SOURCE: Short cycling

The most common cause is the fan relay on the main circuit board. However, if the outside temperature is 30degF and the inside is 60-65degF then the cause could be the insulation is ruined or missing on the backside of the unit's firewall. This can cause the unit's internal thermocouple wire to read below 45degF which is the freeze sentinal temp level. Anything below this temp level will cause the unit to come on for a few minutes to warm up the air and bring it to 46degF or higher to protect internal plumbing from freezing.
The best way to check for this is to manually set the unit to one of the heat modes and the thermostat up just until the heater comes on. Let it run until the unit turns itself off. Then set the mode switch back to Off and see if the unit still cycles on and off as before.
If it does then the main circuit board should be replaced unless you are comfortable de-soldering and re-soldering another fan relay in place.

Posted on Jun 23, 2008

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