Carrier 40TGV0131UP Service Manual page 71

5
Procedure
Push check button to cancel (release from) the test
run mode.
([TEST] disappears on the display and the status
returns to a normal.)
9-1-2. LED Display on P.C. Board (Indoor unit)
1. D501 (Red)
• It goes on (Goes on by operation of the main microcomputer) at the same time when the power supply is
turned on.
• It flashes with 1-second interval (every 0.5 second): When there is no EEPROM or writing-in operation fails.
• It flashes with 10-seconds interval (every 5 second): During DISP mode
• It flashes with 2-seconds interval (every 1 second): While setting of function select (EEPROM)
2. D403 (Red)
• It goes on when power supply of the remote controller is turned on. (Lights on hardware)
3. D503 (Yellow): Main bus communication
• It goes on for 5 seconds in the first half of communication with the central controller.
4. D504 (Green) : Sub bus communication
• It flashes for 5 seconds in the first half of communication with the remote controller. (Group master unit)
• It flashes with 0.2-second interval (for 0.1 second) for 5 second in the latter half of communication between
master and follower in the Gr indoor unit.
5. D14 (Orange)
• It flashes while receiving the serial signal from the outdoor unit. (Hardware)
6. D15 (Green)
• It flashes while sending the serial signal to the outdoor unit. (Hardware)
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