E39-0 — Low Pressure Over Low Protection

What does E39-0 mean?

This error indicates that the system's low pressure (Ps) has been detected as abnormally low for 5 minutes during either cooling or heating operation. If this occurs 3 times in an hour, the failure will be confirmed as unresumable.

• Insufficient refrigerant charge or a refrigerant leak.
• Blockage in the refrigerant line.
• A faulty pressure sensor providing incorrect readings.

Click steps to track your progress.

1. 1

   Turn off the main power to the Haier unit at the circuit breaker.

2. 2

   Wait for at least 30 seconds, then restore power.

3. 3

   Allow the unit to attempt to operate for a short period.

4. 4

   If the error persists or recurs frequently, contact a qualified service technician to check the refrigerant charge and system for leaks.