E7 — Valve trouble (closed valve in cooling or 4-way valve in heating)

What does E7 mean?

This error indicates a problem with a valve in the refrigerant circuit. It could be a closed service valve during cooling operation or an issue with the 4-way reversing valve during heating.

• Improperly opened or closed service valves.
• Faulty 4-way reversing valve.
• Control wiring issue to the valve.
• Malfunctioning valve solenoid.

Click steps to track your progress.

1. 1

   For cooling mode, ensure all service valves on the outdoor unit, especially the liquid line valve, are fully open.

2. 2

   For heating mode, observe if the outdoor unit is attempting to switch correctly between heating and cooling operations.

3. 3

   Verify that control wiring for the 4-way valve is securely connected and not damaged.

4. 4

   Power cycle the unit by turning off the main circuit breaker for a few minutes, then restart.

5. 5

   If the error persists, a technician needs to inspect the valves and their control mechanisms.