M thermal Split
104 202004
Midea M thermal Split
Procedure 4.24.4
C7
Power supply voltage of the unit is low.
Yes
Increase the power voltage to the
required range.
No
The space between the units is too
narrow for heat exchanger.
Yes
Increase the space between the units.
No
Heat exchanger is dirty or something is
block on the surface.
Yes
Clean the heat exchanger or remove the
obstruction.
No
Fan is not running.
Yes
Fan motor or fan is broken, change a new
fan or fan motor.
No
Water flow rate is low.
Yes
There is air in system or pump head is not
enough. Release the air and reselect the
pump.
No
Water outlet temp. sensor
is loosen or
broken.
Yes
Reconnect it or change a new one.
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 10 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 and to Table 4-5.3 in Part 4, 5.1
.
Midea CAC
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