111
Procedure
PL / C7
The inverter module heat sink is blocked
or dirty
Yes
Clean or replace the heat sink
No
The screws connecting the heat sink to
the inverter module are loose
Yes
Tighten the screws and make sure the
heat sink is well-connected
No
Inverter module temperature sensor
connection on main PCB is loose
1
Yes
Ensure the sensor is connected properly
No
Inverter module temperature sensor has
short circuited or failed
2
Yes
Replace the sensor
No
Replace outdoor main PCB
Notes:
1. Inverter module temperature sensor connection is port CN3 and CN3_1 on the main PCB (labeled 5 and 6, respectively, in Figure 5-2.1 in Part 5, 2.1
“Ports”).
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 Table 6-3.3 in Part 6, 3.1 “Temperature Sensor Resistance Characteristics”.
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