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278

Sensor fault from heat pump 278 — Compressor is blocked: Outdoor sensor fault

Nibe · Air Conditioning

What does 278 mean?

The outdoor sensor (Tho-A) has received an unreasonably high or low value 3 times within 40 minutes. This points to a problem with the sensor.

Common Causes

  • Open circuit or short circuit on sensor input
  • Defective sensor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the outdoor sensor (Tho-A) for damage.

  2. 2

    Verify the sensor's connection.

  3. 3

    Test the sensor's electrical readings.

  4. 4

    Replace the sensor if it is faulty.

Browse all codes in this manual (95)
Verified technical data. Last updated: April 2026

Related Faults

107Sensor flt: BT7 HW sens top 107 — Sensor fault: Hot water sensor151Sen flt: CL11- BT51 pool temp sensor 151 — Sensor fault: Pool temperature sensor152Sen flt: CL12- BT51 pool temper- ature sensor 152 — Sensor fault: Pool temperature sensor
Source: Nibe Air Conditioning
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