CodeRegistry
Brands
  1. Home
  2. Daikin
  3. ASHP Error Codes
  4. HC-01
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.

HC-01

HC-01 — Second tank temperature sensor problem

Daikin · ASHP Error Codes

What does HC-01 mean?

An issue has been detected with a secondary temperature sensor for the hot water tank.

Common Causes

  • Defective secondary sensor
  • Wiring fault
  • Incorrect installation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the wiring for the second tank temperature sensor.

  2. 2

    Verify the sensor's placement and condition.

  3. 3

    Reset the unit by cycling the power.

  4. 4

    A professional needs to diagnose the secondary sensor.

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