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Daikin Altherma fault 4-02

Incorrect setting of space heating OFF temperature

Heat pump

What it means

Setting [4-02] defines the space heating OFF temperature. Incorrect setting can cause the space heating to not function as expected.

Likely causes

  1. Incorrect setting of space heating OFF temperature (setting [4-02])
  2. Water pump software control behaviour based on setting [F-0D]

Where to start

  1. Check if setting space heating OFF temperature (setting [4-02]) is correct (keep at 35°C)
  2. Check water pump start/stop conditions
  3. Verify setting [F-0D] configuration (continuous, sample, or request)

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 85), 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.

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