Midea R32 M thermal Arctic Mono fault HA

What it means

Error code 49. Water side heat exchanger water outlet temperature sensor (Sensor Tw_out) fault detected by user interface and hydronic system main PCB.

Likely causes

1. Temperature sensor not connected properly or has malfunctioned. Damaged hydronic system main PCB.
2. Sensor Tw_out circuit fault
3. Sensor damage or disconnection
4. Main board fuse damaged/blown
5. Insufficient refrigerant caused by refrigerant leakage
6. Low pressure side blocked by crushed or bent pipe, blocked EXV, or dirty filter
7. Poor air side heat exchanger heat exchange in heating or DHW mode
8. Insufficient water flow rate in cooling mode
9. Outdoor main PCB fault (last resort)
10. Inverter module damaged
11. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions
12. Crushed or bent pipe
13. Blocked EXV
14. Dirty filter
15. Hydronic box main PCB fault
16. Damaged cables between hydronic box main PCB and outdoor unit main PCB
17. Outdoor unit main PCB fault
18. Incorrect or abnormal input power supply (N or L)

Where to start

1. Identify sensor type based on fault code
2. Locate corresponding port on refrigerant system main PCB for that model
3. Check connection at identified port