R410A DC Inverter VRF V4 Plus W Series 50Hz
MCAC-VTSM-2016-04
222 Troubleshooting
3.16 C7: Temperature protection of inverter module
When the temperature of inverter module is over 80
o
C, it will display C7 protection.
1. How to check whether the temperature sensor is short circuit or disabled
①
:
Using a multi-meter to measure resistance, if the resistance is too small, the sensor is short circuit, if the resistance in certain
temperature is not consistent with attached table 2, the sensor is disabled
3.17 C8: Flow switch break protection
The screw between inverter
module and radiating fin is
loose
Outdoor main PCB is damaged
Replace the outdoor
main PCB
C7
Temperature sensor of main
inverter module is short circuit
or disabled
①
.
Replace the sensor
Yes
No
No
Yes
Tighten the screw,
make
sure
the
inverter module is
closed
to
the
radiating fin
Yes
C8
Lack of water flow of half the
rated flow
Flow switch fault
Outdoor main PCB is damaged
Check the pump and pipeline
whether are blocked, and
troubleshooting
Repair the flow switch or
replace the flow switch
Replace the outdoor main PCB
No
No
Yes
Yes
Yes