Midea V4+R Series Service Manual page 98

V4+R VRF 50/60Hz
4.21.4 Procedure
The inverter module heat sink is blocked
The screws connecting the heat sink to
the inverter module are loose
Inverter module temperature sensor
connection on main PCB is loose
Inverter module temperature sensor has
short circuited or failed
Replace outdoor main PCB
Notes:
1. Refer to Figures 5-1.1 and 5-1.3 in Part 5, 1 "Outdoor Unit Electric Control Box Layout".
2. Refer to Figures 5-1.1 and 5-1.3 in Part 5, 1 "Outdoor Unit Electric Control Box Layout".
3. Inverter module temperature sensor connection is port CN4 on the main PCB (labeled 3 in Figure 5-2.1 in Part 5, 2.2 "Ports").
4. 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 Figures 5-1.1 and 5-1.3 in Part 5, 1 "Outdoor Unit Electric Control Box Layout" and to Table 5-5.3 in Part
5, 5.1 "Temperature Sensor Resistance Characteristics".
96
PL / C7
1
or dirty
No
2
No
3
No
4
No
Yes
Clean or replace the heat sink
Tighten the screws and make sure the
Yes
heat sink is well-connected
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
201608