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Daikin Altherma fault H0-00

Outdoor unit: voltage/current sensor problem

Heat pump

What it means

Compressor voltage (DC) is out of range before start-up.

Likely causes

  1. Faulty main PCB
  2. Faulty inverter PCB
  3. Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%)
  4. Power drop
  5. Short circuit
  6. Thermal interface grease NOT applied properly on the heat sink
  7. Deviation of thermistor (lower temperature measured than actual)
  8. Bad contact between sensor and pipe
  9. Deviation of outlet water after backup heater thermistor (lower temperature measured than actual)
  10. Bad contact between refrigerant loop and inverter heat sink
  11. Lack of refrigerant
  12. Deviation of thermistor (higher temperature measured than actual).

Where to start

  1. Perform a check of the main PCB
  2. Perform a check of the inverter PCB
  3. Check if the power supply is compliant with the regulations per section 4.1 Electrical circuit

The full answer, free

  • 11 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 46), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Daikin manual for the Altherma. Check the model on the data plate before you order parts.

Other Daikin Altherma fault codes