Mitsubishi PWFY-P36NMU-E-BU Service Handbook page 83

(3) Time data storage function
If an error (including a preliminary error) occurs, the error history data and the error detection time are stored into the service
memory.
The error detection time stored in the service memory and the current time can be seen on the service LED.
1) Use the time displayed on the service LED as a reference.
2) The date and the time are set to "00" by default.
3) The time is not updated while the power of the indoor unit is turned off. When the power is turned off and then on again, the
count will resume from the time before the power was turned off. Thus, the time that differs the actual time will be displayed.
(This also applies when a power failure occurs.)
(3)-1 Reading the time data:
1) Time display
Example: 12 past 9
* Disappears if the time data is deviated due to a power failure, or if a
system controller that sets the time is not connected.
2) Date display
When the main controller that can set the time is connected
Example: May 10, 2003
When the main controller that can set the time is not connected
Example: 52 days after power was turned on
Alternate display
Alternate display of year and month, and date
* Appears between the year and the month, and nothing appears
when the date is displayed.
Alternate display
* Appears between the year and the month, and nothing
appears when the date is displayed.
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Day count