E1 90 (FJM Outdoor) — Failure of pipe check operation

What does E1 90 mean?

The FJM outdoor unit displays E1 90, indicating that the system failed to complete the mandatory pipe check operation. This check verifies correct refrigerant piping connections and is typically performed after installation.

• Incorrect refrigerant piping connections
• Improper system setting for pipe check operation
• Refrigerant leak or blockage

Click steps to track your progress.

1. 1

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

2. 2

   Carefully check all refrigerant piping connections for correct installation, tightness, and any signs of leakage.

3. 3

   Review the installation manual to ensure that the system settings related to the pipe check operation are correctly configured.

4. 4

   Restore power and attempt to re-run the pipe check operation if possible via the remote controller or service tool. If the error persists, contact a qualified technician.