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Panasonic Aquarea T-CAP R32 fault H91

Tank booster heater OLP abnormality

Heat pump

What it means

During operation of the tank booster heater, the tank booster heater overload protector (OLP) open circuit is detected. Abnormality judged if condition continues for 60 seconds.

Likely causes

  1. Faulty connector connection
  2. Faulty indoor unit PCB (main)

Where to start

  1. Confirm Force heater request ON by user OR auto turn ON by remote controller during error
  2. Check latest mode selection sent by remote controller (heat/cool/tank)
  3. Determine if the abnormality happened during operation of the tank booster heater; if not, defect is in indoor unit PCB (main) - replace the indoor unit PCB (main)

The full answer, free

  • 4 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 188), 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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