12 Maintenace notes
466
SMGB0064 rev.0 - 08/2011
12.5 Alarm code “31”
Question and answer for the eld work
Example 4: Alarm code “31”
Phenomenon Alarm code “31” sometimes occurred and the system stopped.
Cause
The combination of the indoor units and the outdoor unit was the following.
ON
OFFON ON ON ON
Power
Source
This system was used in a tenant building. One of 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.
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