L3 Open Phase Detection

Was bedeutet F2 ?

The outdoor unit has detected an open circuit in the L3 phase of the main power supply. This indicates a loss of one of the three input phases, potentially leading to unbalanced operation or motor damage.

• Loss of power on phase L3.
• Open circuit in L3 wiring.
• Faulty connection or fuse on L3.

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1. 1

   Measure voltage between L1-L2, L2-L3, and L3-L1 at the outdoor unit main power terminals — expect balanced 3-phase voltage.

2. 2

   Inspect all wiring connections for the L3 phase at the outdoor unit's main power terminals for looseness or corrosion.

3. 3

   Check the integrity of the circuit breaker or fuse protecting the L3 phase in the electrical panel.