MCAC-UTSM-2009-03 Troubleshooting
Outdoor Units 29
10. Troubleshooting
10.1 Indoor Unit Malfunction
Indoor unit display panel
No. Running lamp Timer lamp Defrosting lamp Malfunction
1 ☆ × × Room temp. sensor checking channel is abnormal
2 × × ☆ Evaporator temp. sensor checking channel is abnormal
3 ☆ ☆ ☆ Condenser temp. sensor checking channel is abnormal
4 × ☆ × In-outdoor unit communication malfunction
5 ☆ ● ☆ DC Fan malfunction
6 ☆ ☆ ● EEPROM malfunction
(× Extinguish, Flash at 5Hz, ☆ ● Light)
1. Running lamp flash at 5Hz
Judge: Room temp. sensor checking channel is abnormal
Validate: Check whether the resistance of the room
temp. sensor is correct according to Annex 1
Yes
Replace the room temp. sensor
Replace the indoor main board
No
Running lamp flash at 5Hz
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