Troubleshooting - Mitsubishi PKH-1.6GKLH Technical & Service Manual

9

TROUBLESHOOTING

1. TROUBLE IN TEST RUN
Symptom
The display "CENTRALLY
CONTROLLED" on remote
controller dose not disappear.
When remote controller
POWER button is turned ON,
the check code "EO"appears.
When remote controller
POWER button is turned ON,
operating display appears, but
disappears soon.
Despite turning POWER button
ON, the remote controller dis-
play does not appear.
OC229A
Cause
1) Wrong address setting of remote controller/
indoor controller board
2) Timer adapter is connected to the remote con-
troller.
) Signal transmission error between indoor unit
and remote controller
1) Signal transmission error between indoor unit
and remote controller
1) Short circuit of indoor/outdoor connecting wire
2) Short circuit of transmission wire
) Wrong operation of remote controller due to
noise wave emitted by other appliances
1) Damaged remote controller
2) Short circuit of transmission wire
) Bad contact of indoor CN0
) CN0 is attached to a sub unit.
) Damaged transformer
6) Bad contact of CN2D
7) Blown fuse
8) Circuit breaker OFF
1) Check the address setting of remote controller and
indoor controller.
2) Make sure the timer adapter is used correctly.
) 1 Turn another remote controller's DIP SW17-7 ON to
make it sub controller.
2 Connect the sub controller to the unit, and turn circuit
breaker ON.
● If the display "centrally controlled" disappears,
replace the original remote controller.
● If the display remains the same, replace the indoor
controller board.
1) 1 Connect a sub remote controller.
2 Turn circuit breaker ON.
If the display "centrally controlled" remains, replace
the indoor controller board.
3 If the display disappears, turn the remote controller
POWER button ON and check as follows.
Remote controller
1 Operating Display
2 Operating Display
 No Display
 No Display
1), 2) Check the wire
) Turn the circuit breaker OFF, and then turn ON.
If the remote controller remains abnormal, despite the
above measures, replace the indoor controller board.
1) Measure the voltage between terminals of remote con-
troller. If no voltage, remove the terminals and measure
the voltage between wires. If the voltage is between
6VDC and 12V, replace the remote controller.
2) ~ 8) Check each point.
If it is not defective, replace the indoor controller
board.
1 1
Check points
Sub remote controller Malfunction
Malfunction of
EO Display
indoor Unit
Malfunction of
Operating Display
Remote controller
Malfunction of
EO Display
indoor Unit and
Remote Controller
Malfunction of
Operating Display
Remote controller