Haier · Hydro Split & All-in-One Systems
This error indicates a problem with the four-way valve failing to reverse correctly, which impacts the unit's ability to switch between heating and cooling modes. If this occurs 3 times in an hour, the failure will be confirmed as unresumable.
Click steps to track your progress.
Turn off the main power to the Haier unit at the circuit breaker.
Wait for at least 30 seconds, then restore power.
Try switching the unit between heating and cooling modes to see if the valve can operate.
If the error persists or repeats, contact a qualified service technician to inspect the four-way valve and refrigerant system.