Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 295

[9-4 Maintenance LED Display and Troubleshooting ]
(5) Maintenance LED displays "Er10."
(Meaning or Cause)
Because there was a problem regarding the control board during data storage, data storage is unfinished.
(Solution)
Perform data storage again.
Remove the USB memory stick from the control board and insert it again. Then conduct data storage using Section [9-2-2
Storing Data on a USB Memory Stick]as a reference.
If this still does not correct the problem, there may be a problem with the control board.
(6) System does not start in Normal Mode.
(Meaning or Cause)
The USB memory stick may be left connected.
(Solution)
Remove the USB memory stick from the control board by referring to <Ending the data storage mode> under Section [9-2-2
Storing Data on a USB Memory Stick]. Then press SWP3 (ENTER). If the problem is not resolved, turn off the power to the
outdoor unit, and restart the unit.
(7) Unit cannot be started in the data storage mode.
(Meaning or Cause)
There may be problems with the control board.
(Solution)
Take the two measures 1 and 2 explained in (2) Storing data on a USB memory stick in 1 Procedure under [9-2-2 Storing Data
on a USB Memory Stick].
If the unit cannot be started up in the data storage mode by following either of the two methods 1 or 2, the control board may
be malfunctioning.
2. Collecting operation data
(1) Maintenance LED displays blinking "ON."
(Meaning or Cause)
Despite data collection function being enabled, it is not started yet.
There may be two causes.
Firstly, the initialization process immediately after the system startup may have inhibited the start of data collection.
Secondly, M-NET communication may be underway to enable maintenance tools or collect AE-200 logs.
(Solution)
After a certain time, the problem will resolve itself, requiring no corrective actions.
(2) Maintenance LED displays "F-Er."
(Meaning or Cause)
Because there was a problem with the flash memory used to store operation data, the collection of operation data is unfin-
ished.
(Solution)
Restart the outdoor unit, check the status of data collection.
If the LED displays "F-Er," the flash memory may be broken.
Depending on the local conditions, replace the control board.
When the flash memory is not working correctly, data collection and storage to a memory stick cannot be performed, but the
outdoor unit itself functions normally.
(3) Maintenance LED displays blinking "Err."
(Meaning or Cause)
An error occurred in the unit, suspending data collection.
(Solution)
After resolving the error, resume data collection, referring to 1. Operation procedure (3) Resume data collection under Section
[9-2-3 Collecting Operation Data].
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- chapter 9 BS_09_A1