6 - 8
2WAY SYSTEM
Trouble Diagnosis
6
3. 2WAY Alarm Codes
Alarm code
Alarm meaning
Alarm conditions
After initial communications were completed, an unrecognized unit was detected.
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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
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E20 Alarm
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 TM1(1,2).
(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.
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E24 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause After initial communications were completed, the control wiring between main and sub
outdoor units was disconnected.
(2) After initial communications were completed, the outdoor unit power was turned OFF.
Check
Correction
Example
Notes
E24
Main outdoor unit failed to receive communications from other sub outdoor unit.
After initial communications were completed, communications from an outdoor unit stopped.
(1)
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Position of serial terminal TM1(1,2) on 2WAY
terminal TM1 (1, 2)
SM830253-00_欧州2way7_SM-TRSM.indb 8 16/08/02 14:02:49
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