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Daikin Altherma fault UA-17

Tank type problem

Heat pump

What it means

[E-05] is not set as 1, or [E-07] is not set correctly.

Likely causes

  1. Improper combination of the indoor unit and the water tank
  2. Faulty [E-05] or [E-07] setting
  3. Faulty hydro PCB
  4. Deviation of thermistor
  5. Bad contact between sensor and pipe

Where to start

  1. Check for improper combination of the indoor unit and the water tank using the combination table in the Databook
  2. Check the setting [E-05] and [E-07] via the user interface
  3. Perform a check of the hydro PCB

The full answer, free

  • 1 more check 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 64), 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