Daikin IM 938-4 User Manual (English)

Questions and Answers:

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Cindy HendersonAug 18, 2025
How to fix Daikin IM 938-4 when blowers won’t operate on cool?
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  Cody AliAug 18, 2025
  If the blowers on your Daikin Air Conditioner won’t operate on cool, begin by checking the supply line fuses and circuit breakers to ensure power is on. Blown fuses indicate a circuit overload, short circuit, or a ground condition. Verify the voltage supply to the equipment is within 10% of the voltage on the date plate. If the touchpad/thermostat is faulty, replace it. Also, ensure all connections at the push-button switch are tightened.
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Gregory NelsonAug 20, 2025
What to do if Daikin IM 938-4 compressor runs but blowers don't?
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  Rachael RomeroAug 20, 2025
  If your Daikin Air Conditioner compressor starts and runs on cool but the blowers do not run, the issue could stem from several causes. First, consider replacing a faulty touchpad/thermostat or an open-circuited blower motor. If the blower is rubbing against its housing, adjust the blower motor or blower wheel position. In case the bearings on the blower motor are seized, replace the motor. Lastly, tighten any loose connections at the touchpad/thermostat.
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Kenneth MaddenAug 23, 2025
Why is my Daikin IM 938-4 Air Conditioner providing insufficient or no heat?
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  Brian FranklinAug 23, 2025
  To address insufficient or no heat in your Daikin Air Conditioner, start by checking the power supply line fuse and circuit breakers. Replace a faulty touchpad/thermostat, or replace the wire or tighten a loose connection at the touchpad/thermostat. Adjust the thermostat, rotating the knob to “warm,” if it's set too high. Replace the transformer if there's no power output on the transformer secondary. If the valve is inoperative, temporarily lock the valve open and then replace it, or simply replace it.
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Angela BishopAug 26, 2025
How to troubleshoot Daikin Air Conditioner blowers not working on heat?
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  Andrew Pittman Jr.Aug 26, 2025
  If your Daikin Air Conditioner blowers won’t operate on heat, first check the power supply. Open the heat valve or turn on the heating system. Replace the thermostat if the heat is off due to equipment with heat fan lockout. If the touchpad/thermostat is faulty, replace it. Also, ensure that loose connections at the touchpad/thermostat are tightened and the thermostat is properly adjusted. If the thermostat is set too low, rotate the control knob to “warmer.”
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Emily WatsonSep 1, 2025
Daikin IM 938-4 Air Conditioner: why does fan motor start then stop when compressor runs?
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  Andrea ClarkSep 1, 2025
  If your Daikin Air Conditioner compressor starts and runs on cool, but the fan motor starts and then stops, it could be due to the operation of the internally connected overload device because of a short circuit in the blower motor, in which case, replace the motor. Alternatively, it could be due to windings, rubbing of the blower wheel, or a lack of lubrication in the blower motor bearings; in this case, adjust the blower wheel or motor, or replace them.
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Heather MillsSep 4, 2025
Why is my Daikin IM 938-4 Air Conditioner providing too much cooling?
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  Scott LeeSep 4, 2025
  If your Daikin Air Conditioner is providing too much cooling, it might be due to the thermostat being set too low. Try adjusting the thermostat to a higher setting. If adjusting the thermostat doesn't solve the issue, the thermostat itself may be defective and need replacement.
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Cynthia AndersonSep 6, 2025
What causes 'sweating' in my Daikin IM 938-4 Air Conditioner?
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  James KaneSep 7, 2025
  If your Daikin Air Conditioner is experiencing “sweating,” it could be due to several reasons. Check if the condensate drain from the evaporator to the condenser is plugged and remove any obstructions to water flow. If the insulating seals on the equipment are damaged, adjust or replace them. Also, verify that the evaporator blower motor is running at the correct speed by checking the voltage and replacing the motor if necessary. Finally, ensure that the evaporator blower is correctly positioned and tighten it if loose.
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Virginia BryantSep 9, 2025
Why does my Daikin IM 938-4 Air Conditioner compressor stop shortly after starting on cool?
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  Jason OsborneSep 9, 2025
  If your Daikin Air Conditioner compressor starts and runs on cool, but stops after a short interval, it could be due to the operation of an overload device caused by an overloading compressor motor. Check the voltage supply. Clean the condenser inside and out, and check the outside face of the condenser for recirculation of condenser air. Install air “splitters” if they are missing. Check the compressor for a short circuit. If the compressor is defective, ship the cooling chassis to the nearest McOuay authorized warranty station.
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Carrie RamirezSep 12, 2025
Why does my Daikin IM 938-4 compressor stop occasionally when running on cool?
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  Samuel RichardsSep 12, 2025
  If your Daikin Air Conditioner compressor starts and runs on cool, but occasionally stops (on overload device), it may be due to low voltage from overloaded circuits within the building or the local power system, or high voltage due to fluctuations in the local power system. In the case of low voltage, run a separate electric line to the equipment and consult the local power company. In the case of high voltage, consult the local power company. It could also be due to a partial short circuit in the compressor motor; if confirmed, ship the cooling chassis prepaid to the nearest McOuay authorized warranty station.