Gree GMV-VQ680WM/C-X Service Manual page 300

Gree
4.2.2.1 Mechanical Inspection
（1） Confirm that the unit Power is disconnected.
（2） Find the place corresponding to each sensor on the unit and check if the sensors are
firmly fixed on the unit.
4.2.2.2 Electrical Inspection
Measure the actual temperature and resistance of the temperature sensors, and compare it
with the characteristic curve of the temperature sensors to determine whether the thermocouple is
normal.
（1） Power off the unit. Remove the electrical appliance cover after the ODU stops.
Warning: Electric shock
（2） Remove the electrical appliance cover and check whether the connecting terminal of
the temperature sensors is firm.
（3） Use a thermometer to measure the temperature of the spot sensed by the temperature
sensors.
（4） Disconnect the connecting terminal of the corresponding temperature sensor from the
main board. Use a multimeter to measure the resistance of the temperature sensors
and compare it with the confirmed temperature range.
（5） If the measured resistance and temperature do not match with the resistance and
temperature in the characteristic curve of the temperature sensor, the temperature
sensor needs to be replaced.
（6） If the measured resistance and temperature match with the resistance and
temperature in the characteristic curve of the temperature sensor, but the temperature
of the spot is abnormal according to the monitoring of the unit, the main board needs to
be replaced.
NOTE: Please refer to Appendix 1 for the corresponding relationship between the resistance value
of the temperature sensor and the temperature.
GMV6 HR DC Inverter VRF Units Service Manual
298