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Panasonic Aquarea T-CAP R32 fault F46

Outdoor current transformer open circuit

Heat pump

What it means

A current transformer (CT) open circuit is detected by checking the compressor running frequency (greater than or equal to rated frequency) and CT detected input current (< 1.6 A) for continuously 20 seconds.

Likely causes

  1. Insufficient refrigerant
  2. Outdoor PCB fault
  3. Compressor low
  4. CT defective
  5. Faulty outdoor unit PCB (main)
  6. Compressor defective (low compression)

Where to start

  1. Check refrigerant charge
  2. Inspect outdoor PCB
  3. Inspect compressor

The full answer, free

  • 11 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 211), 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.

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