- 138 -
[
IX
Troubleshooting ]
2
When the remote controller op-
eration SW is turned on, the
operation status briefly ap-
pears on the display, then it
goes off, and the display lights
out immediately, and the unit
stops.
1. The power for the M-NET trans-
mission line is not supplied from
the outdoor unit.
(i) The main power of the out-
door unit is not turned on.
(ii) The connector on the circuit
board of the outdoor unit is
disconnected.
Main circuit board:
CNS1, CNVCC3
INV circuit board:
CNDC2, CNVCC2, CNL2
Gate-amp board:CNDC1
(iii) The power supply circuit of
the outdoor unit is faulty.
Blown fuse (F01) on the G/A
board
Damaged diode stack
Faulty INV circuit board
Damaged rush current pro-
tection resistor (R11, R12)
2. Short circuit of the transmission
line.
3. Incorrect wiring of the M-NET
transmission line on the outdoor
unit.
Disconnected wire for the MA re-
mote controller or disconnected
line to the terminal block.
The indoor transmission line
is connected incorrectly to
the transmission terminal
block for centralized control-
ler (TB7).
4. Disconnected M-NET transmis-
sion line on the indoor unit side.
5. Disconnected wire between the
terminal block for M-NET line
(TB5) of the indoor unit and the in-
door unit board (CN2M) or discon-
nected connector.
(1) If the causes 1-5 apply, LED5 (M-NET
transmission voltage display) on the in-
door controller circuit board will be
turned off.
(2) When 2. and 3. apply, error code 7102
will be displayed on the self-diagnosis
LED.
Check method and remedy
Phenomena
Cause
Check method and remedy
YES
YES
YES
YES
NO
NO
NO
NO
Same symptom for all units in a
system with one outdoor unit?
Check the
self-diagnosis LED
Check 1).
Refer to [4] .6. (2) "Outdoor unit transmission power source circuit
failure judgment" for the check method.
Check for
2 and 3.
Check 4.
Measure voltages of the
terminal block for transmission
line (TB15) on the indoor unit.
9 ~12 V?
Check 5.
Error found?
Indoor unit board or
MA remote controller failure
Correct
the error.
Correct the error.
Is the error code 7102
displayed?
Содержание PU(H)Y-P250YGM-A
Страница 1: ...Models Service Handbook AIR CONDITIONERS PU H Y P250YGM A PUHY P500YGM A PFD P250VM E PFD P500VM E ...
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Страница 72: ... 63 VI Refrigerant Circuit 1 Refrigerant Circuit Diagram 65 2 Principal Parts and Functions 68 ...
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Страница 182: ... 173 X LED Monitor Display on the Outdoor Unit Board 1 How to Read the LED on the Service Monitor 175 ...
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