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Panasonic Aquarea T-CAP R32 fault H67

Abnormal external thermistor 1

Heat pump

What it means

Indicates abnormality detected on external thermistor 1 (room temperature zone 1 sensor), continuing for 5 seconds.

Likely causes

  1. Faulty connector connection
  2. Faulty indoor sub PCB
  3. Indoor communication error

Where to start

  1. Check room temperature Zone 1 sensor wiring and continuity
  2. Check CN205 connector on sub PCB - is it normal? If NO, correct connection.
  3. If CN205 connection is normal, disconnect sensor from sub PCB and measure resistance of sensor, compare against sensor characteristic - is it same? If NO, change external thermistor 1.

The full answer, free

  • 2 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 181), 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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