R410A All DC Inverter Mini VRF MCAC-VTSM-2014-10
84 Troubleshooting
Case: There is no display on PCB of one system, and the problem still exists after replacing PCB. Voltage
values on measuring plate (such as 220V, 5V, 12V, etc.) are normal; after measuring resistance value of
sensor, find that T4 thermo-bulb is earth-continuity, and further discover that the thermal cable of T4
sensor is punched by bolt, as follows:
7.4 E5: Voltage protection malfunction (for all models)
T4 sensor is worn out and
connected with sheet metal
After being reconnected, the
system becomes normal
Voltage protection malfunction
Whether the input voltage is 180-260V.
Replace the filter board and check whether the unit can
operate normally.
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