Troubleshooting; Service Flow - Mitsubishi Electric LGH-F300RX3-E Handbook

4. Troubleshooting

4-1 Service Flow

Confirmation items
1 Condition of trouble – remote controller dis-
play, etc.
2 Frequency of trouble – date of start of opera-
tion and occurrence
3 Occurrence timing
4 Existence of drawings, equipment (including
controllers and equipment sold separately),
cables, wiring, and settings.
Applicable models
Lossnay
LGH-F300 to F1200RX types
Remote controller
PZ-41SLB-E
PZ-52SF-E
Precautions when diagnosing malfunctions
G When removing a transistor or printed circuit board, make sure the breaker is thrown.
G When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force to the surface
mounted parts.
G When removing the circuit board, be careful of the metal edges on the board.
G When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull on the lead
wires.
G When servicing, be sure to recreate the malfunction 2 to 3 times before starting repairs.
G If a malfunction of the printed circuit board is suspected, check for disconnected wires in the print pattern, burnt parts or dis-
coloration.
G If the printed circuit board is replaced, make sure that the switch settings on the new board are the same as the old board.
Trouble Mode 1
Trouble Mode 2
Trouble Mode 3
Trouble Mode 4
— 9 —
The system will not start properly.
• Check the initialization checklist from
installation to operation (table 1-1).
• Check the system checklist (table 1-2).
• An error code displays on the remote
controller.
• The LED of the Lossnay circuit board is
blinking.
Check with the check code list (table 2).
The remote controller does not operate or
operates irregularly.
Check with the remote controller checklist
(table 3).
The Lossnay does not operate or operates
irregularly.
Check with the Lossnay checklist (table 4).