E7: Discharge Temperature Sensor Error (T7C1) - Midea VRF Series Service Manual

V6R VRF 50/60Hz

2.6 E7: Discharge Temperature sensor error (T7C1)

Digital display output
Description
 A compressor top temperature sensor or discharge pipe temperature sensor (T7C1) error.
 All units stop running.
 Error code is displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: Discharge pressure ≥ 3.0MPa and discharge temperature < 15
is running.
 Recover condition: Discharge pressure and temperature go back to normal.
 Reset method: Manually restart.
Possible causes
 Temperature sensor not connected properly or has malfunction.
 Outdoor main PCB damaged.
Procedure
Temperature sensor connection on
outdoor main PCB is loose
Temperature sensor has short-circuited
Replace the outdoor main PCB
Notes:
1. Compressor discharge pipe temperature sensor connections are ports CN4 on the outdoor main PCB
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 6-4.2 in Part 6, 4.1 "Temperature Sensor Resistance Characteristics ".
94
E7
1
No
2
or failed
No
o
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
C for 2 minutes when the compressor