H98

Malfunction Decision Conditions

  • Indoor high pressure is detected when indoor heat exchanger is detecting very high temperature when the unit is operating in heating operation.
  • Phenomena: unit is stopping and re-starting very often in heating mode

Malfunction Caused

  • Indoor heat exchanger thermistor
  • Clogged air filter or heat exchanger
  • Over-bent pipe (liquid side)

Troubleshooting

When abnormality indication starts again
↓
Check the indoor unit intake air filter
⚠
Caution For safety reason and to prevent component breakdown, always switch off the power before remove and connect the component.
↓
Is the air filter dirty?
YES
→
  • Clean the air filter
NO
↓
Check the dust accumulation on the indoor unit heat exchanger
↓
Is the indoor unit heat exchanger dirty?
YES
→
  • Clean the indoor unit heat exchanger
NO
↓
Check the indoor pipe temperature thermistor:
• Plug out connector (CN-TH) from the indoor unit PCB
• Measure the resistance of the indoor heat exchanger temperature thermistor
↓
Is the measured resistance of the indoor pipe temperature thermistor matches the value specified in its characteristic chart?
NO
→
  • Defect in indoor pipe temperature thermistor
  • Replace the indoor pipe temperature thermistor
YES
↓
YES
►
  • Check the piping & installation condition
  • Replace piping / reinstall the unit if necessary
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