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8-2. Diagnostic Procedure for Each Check Code (Outdoor Unit)
1) This section describes the diagnostic method for each check code displayed on the remote controller.
2) In some cases, a check code indicates multiple symptoms.
In this case, confirm LED display on the outdoor P.C. board to narrow the contents to be confirmed.
3) The display on the remote controller may differ from that of LED.
The check code on the remote controller is displayed only when the same trouble occurred continuously by
multiple times while LED of the outdoor P.C. board is displayed when a trouble occurred once.
LED display on outdoor P.C. board
Dip switch setup
• When turning on 1) only of SW803, the latest trouble
is displayed. As the memory is stored, it can be
confirmed even if the power supply is turned off
once. (excluding outside temp. sensor (TO) trouble)
• When the work finished or the outdoor temp.
sensor (TO) trouble was found, turn off all of SW803.
(The trouble which occurs at present is displayed.)
Display selection
• When even a LED of D800 to D804 (Yellow)
goes on, trouble occurrence is indicated. <Display 1>
• If pushing the button switch SW800 for 1 second
under the above condition, the yellow LED is
displayed with flashing. <Display 2>
• When pushing SW800 for 1 second again, the
status returns to <Display 1>.
• The trouble contents can be confirmed by combining
<Display 1> and <Display 2>.
<Display 1> <Display 2>
(No trouble) (Push SW800)(Trouble occurred)
D805 (Green)
D804 (Yellow)
D803 (Yellow)
D802 (Yellow)
D801 (Yellow)
D800 (Yellow)
(Example of discharge temp. sensor trouble)
: Go off, : Go on, : Flash
<Latest trouble display>
Only 1) of SW803 is ON.
<Trouble display, which occurs at present>
All SW803 are OFF. (Initial status)
ON
1234
ON
1234
Check "check code [14]".
Correct wiring of connectors
and terminal blocks.
Replace outdoor P.C. board (MCC-1599).
Correct wiring
and inter-unit cable.
Is setting of group address
of remote controller correct?
Are inner wiring and
inter-unit cables (1, 2, 3) normal?
Are connection of CN01 of MCC-1599 and
wiring of terminal blocks (1, 2, 3) normal?
Replace indoor P.C. board.
Does D502 (Orange LED) flash after
power supply is turned on again?
YES
YES
YES
YES
NO
NO
NO
NO
Check
code
[E04]
Outdoor
LED display
—
Check and troubleshooting
(Item without special mention Indicates part of outdoor unit.)
[Indoor/Outdoor communication trouble]
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