R410A All DC Inverter Mini VRF MCAC-VTSM-2014-10
86 Troubleshooting
7.6 E7: Discharge Temperature Sensor Malfunction (only for 80/105 models.)
1. How to check whether the sensor is normal①:
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 damaged.
2. The phenomenon of the system contains air or nitrogen :
The high pressure is higher than normal value, current is larger than normal value, discharge temperature is higher than
normal value, compressor makes noise, pressure meter do not display steady.
Discharge sensor malfunction.
Check whether discharge temperature sensor’s head is
inside the sleeve or its wiring is connected to the main PCB
properly.
Check whether the discharged sensor is normal. ①
Replace discharge sensor.
Check the operation conditions of the unit meets the
operation requirement（environment temperature,
airflow of the heat exchanger, etc.）
Belongs to the normal protection.
Check whether the refrigerant is charged too much.
Confirm the refrigerant’s weight again.
Check whether the 4-way valve is normal.(No air mixed
up or bad action phenomenon. )
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