Troubleshooting Of Problems - Mitsubishi Electric PUHZ-P200YKA.UK Service Manual

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Check Code
Abnormal points and detection method
M-NET NO RESPONSE
Abnormal if a message was transmitted and
there were reply (ACK) that message was
received, but response command does not
return. Transmitting side detects abnormality
every 30 seconds, 6 times continuously.
Note: The address and attribute displayed at
remote controller indicate the control-
ler that did not reply (ACK).
A8
(6608)

10-5. TROUBLESHOOTING OF PROBLEMS

Phenomena
1. Remote controller display does not
work.
2. "PLEASE WAIT" display is remained
on the remote controller.
3. When pressing the remote controller
operation switch, the OPERATION
display is appeared but it will be
turned off soon.
OCH582B
1 Transmitting condition is repeated
fault because of noise and the
like.
2 Extinction of transmission wire
voltage and signal is caused by
over-range transmission wire.
• Maximum distance ...... 200 m
• Remote controller line (12 m)
3 Extinction of transmission wire
voltage and signal is caused by
type-unmatched transmission
wire.
Type. ........
With shield wire-
CVVS, CPEVS
With normal wire (no shield)-
VCTF, VCTFK, CVV
CVS, VVR, VVF, VCT
Diameter ..... 1.25 mm
4 Accidental malfunction of abnor-
mality-generated controller
Factor
1 12 V DC is not supplied to remote controller.
(Power supply display is not indicated on LCD.)
2 12–15 V DC is supplied to remote controller, however,
no display is indicated.
• "PLEASE WAIT" is not displayed.
• "PLEASE WAIT" is displayed.
1 A t longest 2 minutes after the power supply "PLEASE
WAIT" is displayed to start up.
2 C ommunication error between the remote controller
and indoor unit
3 Communication error between the indoor and outdoor
unit
4 Outdoor unit protection device connector is open.
1 A fter cancelling to select function from the remote
controller, the remote controller operation switch will
be not accepted for approx. 30 seconds.
Case
1 Check transmission waveform or noise on
transmission wire.
2 Turn off the power supply of outdoor unit
and indoor unit and FRESH MASTER or
LOSSNAY at the same time for 2 minutes
or more, and turn the power on again. If
malfunction was accidental, the unit returns
to normal. If the same abnormality gener-
ates again, controller of displayed address
and attribute may be defective.
2
or more
1 C heck LED2 on indoor controller board.
(1) When LED2 is lit.
Check the remote controller wiring for
breaking or contact failure.
(2) When LED2 is blinking.
Check short circuit of remote controller
wiring.
(3) When LED2 is not lit.
Refer to phenomena No.3 below.
2 C heck the following.
• Failure of remote controller if "PLEASE
WAIT" is not displayed
• Refer to phenomena No.2 below if
"PLEASE WAIT" is displayed.
1 Normal operation
2 Self-diagnosis of remote controller
3 " PLEASE WAIT" is displayed for 6 min-
utes at most in case of indoor/outdoor
unit communication error. Check LED3 on
indoor controller board.
(1) When LED3 is not blinking.
(2) When LED3 is blinking.
4 C heck LED display on outdoor controller
circuit board. Refer to "10-10. FUNCTION
OF SWITCHES, CONNECTORS AND
JUMPERS".
Check protection device connector (63H)
for contact failure.
Refer to "10-9. TEST POINT DIAGRAM".
1 Normal operation
42
Judgment and action
Countermeasure
Check indoor/outdoor connecting wire
for miswiring.
(Converse wiring of S1 and S2, or
break of S3 wiring.)
Indoor/outdoor connecting wire is
normal.
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