R410A All DC Inverter Mini VRF MCAC-VTSM-2016-02
78 Troubleshooting
In normal situation:
LED 1: Flash in 1Hz (slowly flash) when standby
LED 1: On when running
LED 2: Off
Phenomenon A
LED 2
red ON
LED 1
green
Flashes 8 times and stops for 1S, then repeat.
Error:
Inverter module failure
Phenomenon B
LED 2
red ON
LED 1
green
Flashes 9 times and stops for 1S, then repeat.
Error:
Low voltage protection
Here are 3 circumstances:
a) The voltage between the two electrolytic capacitors is less than 450V. The AC contactor should be picked
up. If not, there's something wrong with the main control board or the PTC resistors, which need to be
replace correspondingly.
b) Somewhere is loose in the circuit.
c) The voltage between P and N of CN12 on the main control board should range from 450V to 570V. If the
voltage between N terminal and middle terminal of CN12 is 15V while error displays, it means that the main
control board fails. Please replace the main control board.
Phenomenon C
LED 2
Red ON
LED1
Green
Flashes 10 times and stops for 1S, then repeat.
Error:
High voltage protection
Here are 2 circumstances:
1. Three-phase power supply 's voltage is more than 440V
2. Main control board fails. Please replace it.
