Daikin REYQ120TATJU Service Manual (English)

Questions and Answers:

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Christopher EvansAug 9, 2025
Why is my Daikin REYQ120TATJU Heat Pump not cooling or heating air well?
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  Amy Griffin DVMAug 9, 2025
  If your Daikin Heat Pump isn't cooling or heating air effectively, check for these potential causes: * Obstructions blocking the air inlet or outlet of either the indoor or outdoor unit. Remove any obstacles. * Clogged air filters. Clean the air filters. * An enclosed outdoor unit. Remove the enclosure. * Improper temperature settings. Adjust the temperature to a suitable level. * Low airflow rate. Increase it to a proper setting. * Incorrect air diffusion direction. Adjust it to the correct direction. * Open windows or doors. Ensure they are tightly shut. * Direct sunlight exposure. Use curtains or shades on windows. * Too many people in the room. Ensure the model is appropriate for the air conditioning load.
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Heather JacksonAug 15, 2025
Why does my Daikin Heat Pump make intermittent stops?
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  Matthew MartinezAug 15, 2025
  If your Daikin Heat Pump system makes intermittent stops, it could be due to electrical noises from other equipment interfering with communication between the units. Try to eliminate the sources of electrical noise. Once these causes are removed, the system should automatically restart.
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salazarronaldAug 20, 2025
How to fix a Daikin REYQ120TATJU Heat Pump that does not start at all?
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  Mark MurphyAug 20, 2025
  If your Daikin Heat Pump system isn't starting, consider the following: * Blown fuse(s): Turn off the power supply and replace the fuse(s). * Tripped breaker(s): If a breaker knob is in the OFF position, turn the power supply ON. If a breaker knob is tripped, do not turn the power supply ON. * Power failure: After the power is restored, restart the system. * Loose or unplugged connector: Turn off the power supply to verify the connector's connection.
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kristen52Aug 27, 2025
What to do if Daikin Heat Pump does not cool air well?
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  Howard ThompsonAug 27, 2025
  If your Daikin Heat Pump isn't cooling air effectively, it might be in dry operation. Change the system to cooling operation.
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martinmarkSep 1, 2025
What to do if my Daikin Heat Pump starts operation but makes an immediate stop?
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  Ryan CarsonSep 1, 2025
  If your Daikin Heat Pump starts and then immediately stops, it might be due to: * A blocked air inlet or outlet on either the indoor or outdoor unit. Remove any obstructions. * Clogged air filters. Clean the air filters.