Gree E6

What does Gree E6 mean?

E6 is a communication malfunction between the indoor and outdoor units. The troubleshooting procedure checks the connection line between the indoor and outdoor units, the wiring inside the electric box, and whether the indoor and outdoor mainboards match. The unit displays E6.

Symptoms

• Display shows E6
• In cool the compressor stops while the indoor fan runs; in heat all loads stop
• Unit will not start or cuts out shortly after starting
• Often follows wiring or board work on the indoor/outdoor connection

Common causes

• Connection line between indoor and outdoor unit, or wiring inside the electric box, not connected correctly
• Main board of indoor unit does not match that of outdoor unit
• Communication cord damaged
• Indoor or outdoor main board fault

Diagnostic steps

1. 01

   Check the interconnecting wiring

   Cut power and check that the connection line between IDU and ODU and the wiring inside the electric box are correctly connected; rewire per the wiring diagram if not.

2. 02

   Confirm matching boards

   Verify the indoor and outdoor main boards are a matched set; if they do not match, fit the correct board to the product specification.

3. 03

   Replace the communication cord

   If the wiring is correct, inspect the communication cord for damage and replace it if needed.

4. 04

   Replace the indoor main board

   If the fault remains, replace the IDU main board.

5. 05

   Replace the outdoor main board

   If E6 still persists, replace the ODU main board.

When to call a professional

Communication faults usually come down to the interconnecting cable, but ruling that out can mean opening both electric boxes and, ultimately, swapping a main board to a matched specification. That is technician work on live equipment. If a careful check of the connection wiring does not clear E6, bring in a licensed HVAC technician.