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Procedure
Water side heat exchanger water inlet /
outlet temperature sensor is loose
Water side heat exchanger water inlet /
outlet temperature sensor has
short‐circuited or failed
The 4‐way valve is blocked or damaged
Replace outdoor main PCB
Notes:
1.
water side heat exchanger water inlet temperature sensor and water side heat exchanger water outlet temperature sensor connections are port CN6 on
the hydronic box main PCB (labeled 11 in Figure 4‐2.1 in Part4, 2.2 "Main PCB for Hydronic System").
2.
Measure sensor resistance. If the resistance is too low, the sensor has short‐circuited. If the resistance is not consistent with the sensor's resistance
characteristics table, the sensor has failed. Refer to Part 2, 1.2 "Hydronic Box Layout" and to Table 4‐5.1 to 4‐5.2 in Part 4, 5.1 "Temperature Sensor
Resistance Characteristics".
3.
Restart the unit in cooling mode to change the refrigerant flow direction. If the unit does not operate normally, the 4‐way valve is blocked or damaged.
201909 81
PP
1
No
2
No
3
No
Midea CAC Confidential
Ensure the temperature sensor is
Yes
connected properly
Yes
Replace the temperature sensor
Yes
Replace the 4‐way valve
M‐Thermal Split
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