CodeRegistry
Brands
  1. Home
  2. Daikin
  3. ASHP Error Codes
  4. H1-00
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

H1-00

H1-00 — External temperature sensor problem

Daikin · ASHP Error Codes

What does H1-00 mean?

The sensor measuring the external air temperature is experiencing a problem.

Common Causes

  • Defective sensor
  • Damaged wiring
  • Sensor is dirty or obstructed

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the external temperature sensor is clean and not blocked.

  2. 2

    Check the wiring connected to the sensor.

  3. 3

    Restart the unit.

  4. 4

    If the problem persists, the sensor may need replacement.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

7H-017H-01 — Water flow problem7H-047H-04 — Water flow problem during domestic hot water production7H-057H-05 — Water flow problem during heating/sampling
Source: Daikin ASHP Error Codes
Open Manual (Page 3)Search more codes in this manual