Troubleshooting By Inferior Phenomena - Mitsubishi Electric PUHZ-P200YHA Service Manual
Split-type, heat pump air conditioners
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Also See for PUHZ-P200YHA:
- Service manual (94 pages) ,
- Installation manual (13 pages) ,
- Technical data book (82 pages)
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Error Code
Abnormal point 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 con-
troller that did not reply (ACK).
A8
(6608)
11-5. TROUBLESHOOTING BY INFERIOR PHENOMENA
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.
1 Transmitting condition is
repeated fault because of
noise and the like.
2 Extension of transmission wire
voltage and signal is caused
by over-range transmission
wire.
• Maximum distance.......200m
• Remote controller line....(12m)
3 Extension of transmission wire
voltage and signal is caused
by type-unmatched transmis-
sion wire.
Type.....
With shield wire-
CVVS, CPEVS
With normal wire (no shield)-
VCTF, VCTFK, CVV
CVS, VVR, VVF, VCT
Diameter.....1.25mm² or more
4 Accidental malfunction of
abnormality-generated control-
ler
Factor
1DC12V is not supplied to remote controller.
(Power supply display
is not indicated on LCD.)
2DC12~15V is supplied to remote controller, however,
no display is indicated.
• "PLEASE WAIT" is not displayed.
• "PLEASE WAIT" is displayed.
1At longest 2 minutes after the power supply "PLEASE
WAIT" is displayed to start up.
2Communication error between the remote controller
and indoor unit
3Communication error between the indoor and outdoor
unit
4Outdoor unit protection device connector is open.
1After cancelling to select function from the remote
controller, the remote controller operation switch will
not be 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 mal-
function was accidental, the unit returns to
normal. If the same abnormality generates
again, controller of displayed address and
attribute may be defective.
1Check LED2 on indoor controller board.
(1) When LED2 is lit.
(2) When LED2 is blinking.
(3) When LED2 is not lit.
2Check the following.
• Failure of remote controller if "PLEASE
WAIT" is not displayed
• Refer to No.2 below if "PLEASE WAIT" is
displayed.
1Normal operation
2Self-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 con troller board.
(1)When LED3 is not blinking.
(2)When LED3 is blinking.
4Check LED display on outdoor controller
circuit board. Refer to 11-10.
Check protection device connector (63H)
for contact failure.
Refer to 11-9.
1Normal operation
36
Judgment and action
Countermeasure
Check the remote controller wiring for
breaking or contact failure.
Check short circuit of remote controller
wiring.
Refer to No.3 below.
Check indoor/outdoor connecting wire
for miswiring.
(Converse wiring of S1 and S2, or
break of S3 wiring.)
Indoor/outdoor connecting wire is nor-
mal.
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Troubleshooting
