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Daikin Altherma fault C-07

Incorrect setting of unit control method

Heat pump

What it means

Setting [C-07] controls the unit control method (leaving water control, room thermostat control, ext. room thermostat control). Incorrect setting can cause operational issues.

Likely causes

  1. Incorrect setting of unit control method (setting [C-07]) (leaving water control, room thermostat control, ext. room thermostat control)
  2. Water pump software control behaviour based on setting [F-0D]

Where to start

  1. Check if setting [C-07] (leaving water control, room thermostat control, ext. room thermostat control) is set according to the application
  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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