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Panasonic Aquarea T-CAP R32 fault H90

Indoor/outdoor abnormal communication

Heat pump

What it means

During operation of cooling and heating, the data received from the outdoor unit in indoor unit signal transmission is checked whether it is normal. Abnormality judged if condition continues for 1 minute after operation.

Likely causes

  1. Internal/external cable connection fault
  2. Indoor/Outdoor PCB fault
  3. Faulty outdoor unit PCB (main)
  4. Faulty indoor unit PCB (main)
  5. Indoor-outdoor signal transmission error due to wrong wiring
  6. Indoor-outdoor signal transmission error due to disturbed power supply waveform
  7. Indoor communication error

Where to start

  1. Check indoor/outdoor PCB
  2. Check the indoor-outdoor units connection wires for wiring errors; if wiring error found, correct the indoor-outdoor units connection wires
  3. If no wiring error, turn OFF the power and disconnect terminal 3 wire. Turn ON the power and measure Vdc between terminal 2 & 3 from the outdoor unit

The full answer, free

  • 3 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 187), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Panasonic manual for the Aquarea T-CAP R32. Check the model on the data plate before you order parts.

Other Panasonic Aquarea T-CAP R32 fault codes