Daikin AKZ439 - User Manual

Questions and Answers

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Christy BrockAug 20, 2025
How to troubleshoot Daikin AKZ439 when the unit doesn't turn on?
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  Ernest PhillipsAug 20, 2025
  If your Daikin Air Conditioner isn't powering on, check if the power cable is properly connected to the power supply terminal. Also, inspect the transformer's wire connection. If the transformer fuse has melted, it is recommended to consult a DAIKIN service center.
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Stuart BarnettAug 22, 2025
What to do if my Daikin AKZ439 pump and compressor are running but oil cannot be cooled?
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  heathermaloneAug 22, 2025
  If your Daikin Air Conditioner's pump and compressor are running, but the oil isn't cooling, here are a few things to check: * Ensure there are no obstructions near the air intake or exhaust port. * Clean the air filter. * Verify that the temperature setting is appropriate. If the exhaust air temperature is almost the same as the room temperature while the compressor is running, the refrigerant gas may be low and needs refilling. Also, if the room temperature is high, compare the unit's capacity in the operating temperature range against the catalog to see if you need a model with higher capacity.
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Patricia RhodesAug 25, 2025
Why does my Daikin AKZ439 show a high pressure error?
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  Brittney EdwardsAug 25, 2025
  A high pressure error on your Daikin Air Conditioner can occur if the oil or room temperature is too high. Ensure you are using the unit within its specified operating range. Also, make sure there are no obstructions blocking the air intake or exhaust port, maintaining a clear space of at least 500 mm. A clogged air filter can also cause this issue, so clean it. If none of these solve the problem, contact the DAIKIN Contact Center.
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Russell BaldwinAug 26, 2025
What to do if oil does not flow in Daikin Air Conditioner, although the pump is running?
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  Jessica GutierrezAug 27, 2025
  If oil isn't flowing in your Daikin Air Conditioner despite the pump running, and the pump sound level is high, check the following: 1. Ensure the pump suction pipe connection is tight. Check the pipe packing and retighten it securely. 2. Clean the suction strainer. If the oil in the oil tank is dirty, replace it. 3. Refill oil into the oil tank if the oil level is low. 4. If there's a large pressure loss in the oil discharge pipe, increase the oil pipe diameter and shorten the pipe length.
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Alicia EricksonAug 28, 2025
What causes a compressor high temperature error in my Daikin Air Conditioner?
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  Steven JohnsonAug 28, 2025
  A compressor high temperature error in your Daikin Air Conditioner can be caused by a few factors. First, check if the oil or room temperature is higher than the specified operating range and adjust accordingly. Ensure that there are no obstructions near the air intake or exhaust port that could impede ventilation. Lastly, a dirty air filter or condenser can also lead to this error, so make sure to clean them.
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Marcus WaltonAug 29, 2025
What to do if Daikin Air Conditioner compressor does not run, although the pump is running?
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  Ashley WilliamsAug 30, 2025
  If your Daikin Air Conditioner's compressor isn't running even though the pump is, it could be due to several reasons: * The compressor restart prevention timer may be active. Check if the compressor starts after the timer's preset time has elapsed. * The low oil temperature protection device might be activated. Ensure the inlet oil temperature is 5°C or higher for normal operation. * The low ambient temperature protection device could be activated. Make sure the room temperature is 0°C or higher. * The capacity setting might be at 0% (Mode 9). Change the operation mode to a suitable setting.
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Summer RamseyAug 31, 2025
What causes the pump over-current relay to activate on my Daikin Air Conditioner?
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  Elizabeth LevineSep 1, 2025
  If the pump over-current relay is activated on your Daikin Air Conditioner, it could be due to several reasons: * The pump might be overloaded with high-viscosity oil. Use an operating fluid that provides 1.4 to 200 mm2/s viscosity within the specified oil temperature range. * The power supply voltage may be too low, causing the pump current to increase. Check if the voltage is within the specified operating range and look for any instantaneous voltage drops when peripheral equipment starts up. * There may be a break in the pump motor wiring (open-phase), or a foreign object caught in the pump, or a fault in the pump motor. In these cases, replace the pump motor.
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sanchezalecSep 2, 2025
How to fix DC fan motor lock error on Daikin Air Conditioner?
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  Amy CoxSep 2, 2025
  To address a DC fan motor lock error on your Daikin Air Conditioner, check the following: * Inspect the signal and engine wires between the filter board and the inverter board for any breaks or loose connections, as a drop in DC voltage can cause insufficient fan motor speed. * Examine the connector insertion and wires for breaks, as a fan motor-control board communication error may be the cause. If necessary, replace the control board. * If the DC fan motor is faulty, replace it.
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Mrs. Jessica WilliamsSep 4, 2025
Why can't I set the operation on my Daikin AKZ439?
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  Tonya FrostSep 4, 2025
  If you're unable to set the operation on your Daikin Air Conditioner, here are a couple of things to check: * If you see “---” on the data display, the temperature sensor for the selected operation mode may not be connected. Ensure the corresponding temperature sensor is properly connected. * If “---” briefly appears when you press the [ENT] key, the protect switch might be ON. Turn OFF the protect switch (SW1) on the control board.
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ohartSep 6, 2025
What to do if Daikin AKZ439 Air Conditioner pump does not run?
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  Craig JordanSep 6, 2025
  If the pump on your Daikin Air Conditioner isn't running, check the following: * Ensure the remote control input ([10]–[11]) is ON by checking the connection of the remote control input. * Verify that the unit isn't set to the operation lock mode. If it is, cancel the Lock mode on the control panel.