6 - 7
Mini VRF SYSTEM
Trouble Diagnosis
6
3. Mini VRF Alarm Codes
Alarm code
Alarm meaning
Alarm conditions
After initial communications were completed, an unrecognized unit was detected.
•
•
Probable cause (1) The number of indoor units set at the indoor unit quantity setting SW (SW3, SW4) on the
Outdoor Unit Control PCB is less than the number set.
(2) The inter-unit control wiring is wired incorrectly.
Check
(2) Check the inter-unit control wiring at the indoor and outdoor units.
Correction
address setting again.
Example
Notes
E16
Auto address setting alarm (too many units)
The number of indoor units was too many when auto address setting was performed.
(1) See the section "7. TEST RUN" and check the number of indoor units that is set.
After correcting the indoor unit quantity setting or the inter-unit control wiring, perform auto
—
—
Alarm code
Alarm meaning
Alarm conditions
Probable cause
(2) Serial wire is disconnected at the outdoor unit.
(3) The power is OFF at all indoor units in the system.
Check
(2) Check whether serial wire is disconnected at the terminal base.
(3) Check the power at the indoor units.
Correction
Example
Notes
E20
No indoor units at auto address setting.
When auto address setting was performed, no indoor units were recognized.
(1) The inter-unit control wiring from the outdoor unit to the indoor units has been cut.
(1) Check whether the inter-unit control wiring from the outdoor unit to the indoor units is cut.
(1) Reconnect the inter-unit control wire from the outdoor unit to the indoor unit.
—
Position of serial terminal base
terminal base
SM830289-00_Sec6.indd 7SM830289-00_Sec6.indd 7 2021/01/29 16:15:412021/01/29 16:15:41
To Next Page