Code 48 — Lost Inverter Communications

What does 48 mean?

This fault indicates a loss of communication with the inverter, primarily affecting Greenspeed/Extreme and 18VS,19VS/V-HP/AC systems. The inverter controls the variable speed compressor and fan.

• Damaged or loose communication wiring
• Faulty inverter board
• Control board malfunction
• Power supply interruption to the inverter

Click steps to track your progress.

1. 1

   Turn off the power to the outdoor unit at the circuit breaker for 30 seconds, then restore.

2. 2

   Visually inspect external wiring connections if safely accessible and you have electrical experience.

3. 3

   Ensure the outdoor unit is clear of debris and well-ventilated.

4. 4

   If the communication issue persists, contact a qualified HVAC technician for diagnosis.