Panasonic U-72MF1U9 Service Manual

Also see for U-72MF1U9: Installation instructions Operating instructions Operating instructions Technical data

3 - 26Trouble Diagnosis1234567Currently the blinking inspection display can be displayed only on the wired remotecontroller and system remote controller.Blinking inspection display (1) (Automatic backup)Alarm code (Blinking inspection display)Alarm meaning Automatic backup is in progress. A/C units can be operated.Status: The compressor at one of the outdoor units where the outdoor unit fan is runningshould be operating.* Blinking inspection display also occurs when seizing of the compressor magnet SW isdetected. Because this may also be the case, refer to “Blinking inspection display (2)(compressor magnet SW seizing detection).”Alarm conditions When alarm P16, P22, P26, P29, Hx1, Hx2, or H31 has occurred, correcting the control device(remote controller, etc.) input engages this mode.Probable cause Because alarm P16, P22, P26, P29, Hx1, Hx2, or H31 has occurred, check the alarm historythen refer to the corresponding items.Correction Follow the instructions in the corresponding items to correct the trouble.Recovery After repairing the malfunctioning locations, reset the power for the system (all outdoor units).Caution: Automatic backup mode will not be canceled until the power is reset.Notes Automatic backup mode is not engaged in cases of alarms other than those listed above.Reasons: There is no need for automatic backup if recovery is possible by correcting theremote controller input.With alarms for which automatic recovery is possible (such as sensor alarms), thepresence of electrical noise may result in a new alarm. Howeve r, it is believed thatthis occurs for a comparatively short time only. In these cases, a mode (automaticbackup mode) that limits operation may be engaged.Control is not possible when a communications system alarm has occurred.Automatic backup mode is not engaged in order to avoid causing secondarydamage.CAUTION4. Blinking (Inspection) Display on the Remote Controller