Midea R32 M thermal Arctic Mono fault E2

What it means

Communication error between outdoor unit and user interface. M thermal Mono stops running. Error code is displayed on hydronic system main control board for refrigerant system and user interface.

Likely causes

1. Loose wire connections at communication terminals block
2. Loose wiring
3. Damaged PCB or terminals
4. Communication wires not connected in daisy chain topology
5. Short circuit, disconnection, or misconnection of communication wires
6. Damaged main PCB or electric control box communication terminals block
7. Communication wires between outdoor unit and user interface not connected properly
8. Communication wiring X Y E terminals misconnected
9. Loosened wiring within electric control box
10. Short circuit in communication wires, disconnected wires, or incorrect wire connections
11. Loose communication wiring, damaged communication cable, PCB malfunction, shielding issue
12. Wires not fully inserted into connectors
13. Hydronic box main PCB fault
14. Damaged cables between hydronic box main PCB and outdoor unit main PCB
15. Outdoor unit main PCB fault
16. Incorrect or abnormal input power supply (N or L)

Where to start

1. Check if wires between outdoor main control board for refrigerant system and electric control box communication terminals block are loose
2. Step 1: Check communication wire connections between outdoor unit and user interface
3. Step 3: Inspect electric control box for loosened wiring