Specifications

102
MVCU -2009 Troubleshooting
MCC-C Series
Wired Remoted Control
Error Code at 7 Segment Display Operation / Faulty Indication
Blink E1 Room sensor contact loose / short
Blink E2 Indoor coil sensor contact loose / short
Blink E3 Outdoor coil sensor contact loose / short
Blink E4 Compressor overload
Blink E5 Gas leak
Blink E6 Pump faulty
Phase Sequencer
The unit with Scroll Compressor can only rotate in one direction. For this reason, a protective device (phase
sequencer) is fi tted to prevent incorrect wiring of the electrical phases. When the three phases are not connected
correctly, the phase sequencer operates, and the unit will not start. This device is located in the control box of
the outdoor unit.
LED Indicator Lights : Normal Operation and Fault Conditions for Cooling Unit
LED_P
(Red)
LED_R
(Yellow)
LED_S
(Yellow)
LED_T
(Yellow)
Normal Operation On - - -
Reverse Phase Blink Blink Blink Blink
S & T Phase Missing Blink - Blink Blink
T Phase Missing Blink - - Blink
S Phase Missing Blink - Blink -
R Phase Missing ----
Overload Blink - - -
Sensor Missing Blink On On On
Note: 1. “-” means LED off.
2. When R phase missing, no LED or buzzer will indicate the error, but relay 71 (Common) and 81
(NO) will cut off.
3. The unit will check the discharge sensor availability only during power up.
4. All errors can only recover through manually reset.
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