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12 Maintenance notes
12.3 Alarm code "31"
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Question and answer for the field work
Phenomenon
Alarm code "31" sometimes occurred and the system stopped.
The combination of the indoor units and the outdoor unit was the following.
Cause
This system was used in a tenant building. One of the tenant's customers turned OFF the main switch for the indoor unit while
other indoor units are running. This results in a different setting of the total indoor unit capacity in the same refrigerant cycle.
Countermeasure
All the main switches for the indoor units were always ON.
350
SMGB0065 rev. 1 - 12/2010
Example: Alarm code "31"
ON
Power
Source
ON
OFF
ON
ON
ON
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Troubleshooting
