Welcome To The ACHR News Troubleshooting Page


On this exclusive Air Conditioning Heating Refrigeration News page on our site, you’ll find the solutions to the troubleshooting problems published in ACHR News Extra Edition.

Once you’ve reviewed the problem in Extra Edition and checked the answer we present here, feel free to use the submission form below to send us comments or suggestions. We update this page regularly, and we can add your comments to the archived problem answers if you give us permission to do so.

You can also use the submission form to enter our contest by letting us know about specific troubleshooting situations you’ve encountered and solved.

If your submission winds up being the basis for a troubleshooting problem published in Extra Edition, we’ll send you a courtesy copy of the technician training DVD “Electrical Troubleshooting & Schematics for Electromechanical and Electronic Systems: Schematic Symbols and Translating What They Mean”, a $60.00 value.


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May 8, 2017 Issue Answer:

Our test procedures at the indoor coil showed both a higher-than-normal static pressure differential and temperature drop, proving that the coil needs to be cleaned.


June 5, 2017 Issue Answer:

The initial diagnosis is incorrect. The source of the problem is the check valve that is leaking into the indoor coil.


July 10, 2017 Issue Answer:

Two possibilities in this case are a failed thermostat or a problem with the thermostat wiring that is preventing a circuit to the ‘O’ connection on the control voltage terminal board. Without 24-volts applied to this terminal, the reversing valve solenoid isn’t energized, preventing the system from shifting to the cooling mode.


August 7, 2017 Answer:

The component that is suspect is the condenser fan motor. The proper current draw for this motor (part # 621911) is 1.4 Amps. The lower-than-normal current draw indicates that the motor is failing. Intermittently, the motor overheats and stops, the compressor kicks off on overload and attempts a short cycle re-start, which results in a blown fuse.


September 4, 2017 Answer:

What we need to do is correct the reverse polarity power supply problem. Our meter tests showed that the wiring to the equipment is showing a 115V reading from the neutral side of the wiring system to ground, and a 0-V reading from the hot side of the wiring system to ground.


October 9, 2017 Answer:

We need to correct the wiring on the contactor. When it was installed, the L1 and L2 connections were reversed.


November 6, 2017 Answer:

Sequencer #1 needs to be replaced. Our meter tests showed that while its terminals M1 and M2 are closed and operating element #1, the A1 and A2 terminals are not closing, preventing the operation of sequencer #2, which interrupts the entire sequence of operation of elements 2, 3, 4 and 5.


December 4, 2017 Answer:

The replacement transformer has failed and needs to be replaced. The underlying cause of the failure is a short in the control wiring. To get this equipment properly back on line, we need to replace the shorted control wiring before replacing the transformer.


January 8th, 2018 Answer:

The solution to this problem is to change the speed of the indoor fan motor. The temperature rise was found to be 5-degrees too high due to the motor operating on low speed. Changing to medium low will provide sufficient air flow that will allow for proper temperature rise and proper air flow to the problem bedroom.


February 12th, 2018 Answer:

The problem with this equipment is that the return air duct is leaking, allowing warm, moist air into the air handling system. We proved this condition when we measured an increased level of specific humidity when comparing our dry bulb and wet bulb temperature readings.


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