1580 <1608> (EF) 4-way valve trouble in heating mode

What does 1580 <1608> (EF) mean?

This error indicates a problem with the 4-way valve, specifically when the system is operating in heating mode. This critical component directs refrigerant flow for heating and cooling, and a fault can arise from valve failure, coil issues, or wiring problems.

• 4-way valve failure.
• Disconnection or failure of 4-way valve coil.
• Clogged drain pipe.
• Disconnection or loose connection of connectors.
• Malfunction of input circuit on outdoor multi controller circuit board.
• Defective outdoor power circuit board.

Click steps to track your progress.

1. 1

   Turn off the power to the outdoor unit at the circuit breaker.

2. 2

   Check for any loose or disconnected wiring connections related to the 4-way valve and its coil.

3. 3

   Inspect the drain pipe for any clogs or obstructions, as this can indirectly affect valve operation.

4. 4

   Restore power to the unit. If the error continues, contact a qualified HVAC technician.

5. 5

   A technician will need to diagnose the 4-way valve, its coil, and potentially the circuit boards.