Panasonic U-4LE1E5, Service Manual, Page: 103 / 133

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5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
E20 No Indoor Units Error
Error Detection Method
Error Diagnosis
It is judged an error if an indoor unit cannot be recognized at the start of auto address setting or when the outdoor unit is turned
on.
1.
2.
The indoor unit is not turned on. •
The address(es) of indoor unit(s) are not assigned correctly. •
The indoor/outdoor control line may be disconnected somewhere between the indoor unit(s)
and the outdoor unit. Check and make sure the indoor/outdoor control line is connected.
Are the address(es) of indoor unit(s) assigned correctly? 1-1
Are the indoor units turned on? 1-2
1-3
1-2
Set its address
1-3
Power on
Yes
No
1 Indoor Unit
Yes
No
SM830195-01̲Mini VRF SYS.indb 23 SM830195-01̲Mini VRF SYS.indb 23 2011/12/20 16:32:38 2011/12/20 16:32:38