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Trianco Activair R32 S700, S1200 fault ER09

Communication failure

Heat pump

What it means

Communication failure between wired controller and main control board or between control modules.

Likely causes

  1. Faulty communication cable
  2. Loose connector
  3. Wired controller fault

Where to start

  1. Check wiring between wired controller and main control board
  2. Check connector CN2/communication terminals

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 11), 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 Trianco manual for the Activair R32 S700, S1200. Check the model on the data plate before you order parts.

Other Trianco Activair R32 S700, S1200 fault codes