MCAC-UTSM-2008-05 Troubleshooting
Outdoor Units 61
4. E4 malfunction
LED indicates E4
Check whether the wiring of the outdoor ambient temperature
sensor (T4) is break off
Replace outdoor main board
Judge 1: Outdoor ambient temp. sensor (T4) is malfunction
Connect the wiring well
Yes
No
Check whether the resistance of outdoor ambient temperature
sensor (T4) is wrong refer to the Annex 1
Yes
Replace outdoor ambient
temperature sensor (T4)
No
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