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H9: Outdoor Air Thermistor Error (Daikin)

Daikin heat pump outdoor air temperature sensor has failed.

What This Error Code Means

The outdoor air temperature thermistor circuit is open or shorted.

Common Causes

  • Sensor wiring damaged by weather
  • Outdoor thermistor failed
  • Connector corroded from moisture
  • Rodent damage to sensor wires
  • Sensor housing water ingress

Affected Brands

Daikin

How ROMA Heating Fixes This

  • Inspect outdoor sensor and wiring
  • Check connector for corrosion
  • Measure sensor resistance vs ambient temperature
  • Replace outdoor thermistor
  • Verify outdoor temperature reading

Why Trust ROMA Heating

24/7 Emergency

True round-the-clock service including weekends and holidays

Licensed Technicians

TSBC licensed and trained on all major heat pump brands

Fast Diagnosis

We know exactly how to interpret and resolve error codes

Related Services

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