Error E5 and Indoor Red LED flashes 2 times — Communication error during operation

What does E5 mean?

Normal communication between the indoor and outdoor units has been interrupted for more than 2 minutes while the unit is operating. This could be due to issues with wiring or temporary electrical noise.

• Unit No. setting error (incorrect addressing)
• Broken or faulty remote control wire or connection
• Faulty outdoor unit control PCB
• Temporary electrical noise interference

Click steps to track your progress.

1. 1

   Turn the main power breaker off and then back on (perform a power source reset).

2. 2

   Inspect the signal wire connections at the outdoor unit terminal block for any disconnections, looseness, or damage.

3. 3

   Check the signal wires between the indoor and outdoor units for any faulty connections or physical breakage.

4. 4

   If the issue was caused by temporary noise, the unit may return to normal operation after a power reset. Otherwise, professional inspection is recommended.