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Danby Air Conditioner is short cycling

If your Danby air conditioner is short cycling, the unit may start normally but shut off too soon, then keep repeating the cycle. This kind of AC turns on and off quickly problem is usually tied to the controls that manage power and temperature feedback. The most likely causes are a faulty control board, a defective main control board, or a bad user control and display board, since these parts regulate voltage and operating commands to the fan, compressor, and other components. Before replacing a board, check the sensing parts that tell the unit when to run. A failed thermistor or temperature sensor can send the wrong air temperature reading to the control board and make the air conditioner keep cycling. A temperature control thermostat can also cause Danby window AC short cycling if it shuts the compressor off too soon or does not allow the proper delay for refrigerant pressure to equalize. Use your model number on RepairClinic.com to find the exact replacement control board, thermistor, temperature sensor, thermostat, or display board for your specific Danby air conditioner.

01 - Danby Air Conditioner Control Board

The control board regulates the voltage to all of the air conditioner components. If the control board fails, the air conditioner may short cycle. Control boards are often misdiagnosed; make sure to check more commonly defective parts first before replacing the control board.

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Highly Likely

02 - Danby Air Conditioner Main Control Board

The main control board regulates the voltage to all of the air conditioner components. If the control board fails, the air conditioner may short cycle. Control boards are often misdiagnosed; make sure to check more commonly defective parts first before replacing the main control board.

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Highly Likely

03 - Danby Air Conditioner User Control and Display Board

The user control and display board allows the user to operate the unit by selecting fan speeds and cooling temperatures. If the board is defective, the air conditioner may short cycle. If the temperature sensor or thermistor tests appropriately with a multimeter, it's possible the user control and display board is malfunctioning and will need to be replaced.

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Highly Likely

04 - Danby Air Conditioner Thermistor

The thermistor is a sensor connected to the control board that detects the temperature of the air. The resistance value of the thermistor changes in conjunction with the air temperature. If the air temperature rises, the resistance value will decrease. A malfunctioning thermistor may cause the air conditioner to short cycle. To determine if the thermistor is at fault, use a multimeter to test it for continuity. If the thermistor does not have continuity, or if the resistance of the thermistor does not change with a change in temperature, replace the thermistor. (To find specific temperature and resistance values, try check...ing your user’s manual.)

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05 - Danby Air Conditioner Temperature Sensor

The temperature sensor is connected to the control board and detects the temperature of the air. The resistance value of the sensor changes in conjunction with the air temperature. If the air temperature rises, the resistance value will decrease. A malfunctioning temperature sensor may cause the air conditioner to short cycle. To determine if the sensor is at fault, use a multimeter to test it for continuity. If the sensor does not have continuity, or if the resistance of the sensor does not change with a change in temperature, replace the component. (To find specific temperature and resistance values, try checking your us...er’s manual.)

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06 - Danby Air Conditioner Temperature Control Thermostat

The temperature control thermostat is a sensor which monitors the temperature of the air and activates a switch to provide power to the fan and compressor when the air temperature drops below a set point. If the thermostat isn’t working, the air conditioner may short cycle. When the thermostat shuts the compressor off there needs to be approximately a five to ten minute delay to let the refrigerant equalize before the compressor will start again. If the refrigerant has not had time to equalize the compressor may not start. If the thermostat is short cycling it will need to be replaced. To determine if the temperature contr...ol thermostat is defective, use a multimeter to test it for continuity. If the thermostat does not have continuity, replace it. (Note: Some thermostats may also control a heater and, as a result, will have three terminals. Refer to your air conditioner’s wiring diagram for more information.)

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Common

Frequently Asked Questions

Why is my Danby air conditioner short cycling?

How do I test a Danby AC thermistor or temperature sensor?

Can a bad temperature control thermostat make a Danby air conditioner keep cycling?

Should I replace the control board if my Danby AC turns on and off quickly?

How do I find the right replacement part for my Danby air conditioner?

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