Troubleshooting By Inferior Phenomena - Mitsubishi Electric PUHZ-RP8YHA Technical & Service Manual

Error Code Meaning of error code and detection method
M-NET•NO RESPONSE
Abnormal if a massage was transmitted
and there were reply (ACK) that massage
was received, but response command
does not return. Transmitting side detects
abnormality every 30 seconds, six times
continuously.
Note) The address and attribute displayed
at remote controller is indicate the
controller that did not reply (ACK).
A8
(6608)

13-5. TROUBLESHOOTING BY INFERIOR PHENOMENA

Phenomena
1. Remote controller display does not
work.
2. "H0" 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.
4. Even controlling by the wireless
remote controller no beep is heard
and the unit does not start operat-
ing. Operation display is indicated
on wireless remote controller.
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····1.25mm
4 Accidental malfunction of
abnormality-generated
controller.
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.
• "H0" is not displayed.
• "H0" is displayed.
1At longest 2 minutes after the power supply "H0" 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
be not accepted for approx. 30 seconds.
1The pair number settings of the wireless remote
controller and indoor controller circuit board are mis-
matched.
41
Case
1 Check transmission wave form or noise on
transmission wire.
2 Shut off the power supply of outdoor unit and
indoor unit and FRESH MASTER or LOSS-
NAY at the same time for two minutes or
more, and put 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.
or more
2
1Check LED2 on indoor controller circuit
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 No.3 below.
2Check the following.
• Failure of remote controller if "H0" is not
displayed
• Refer to No.2 below if "H0" is displayed.
1Normal operation
2Self-diagnosis of remote controller
3"H0" is displayed for 6 minutes at most. in
case of indoor/outdoor unit communica-
tion error. Check LED3 on indoor con-
troller board.
(1)When LED3 is not blinking.
Check indoor/outdoor connecting wire
for mis-wiring.
(Converse wiring of S1 and S2, or
break of S3 wiring.)
(2)When LED3 is blinking.
Indoor/outdoor connecting wire is nor-
mal.
4Check LED display on outdoor controller
circuit board. Refer to page 55 and 56.
Check protection device connector (63L
and 63H) for contact failure.
Refer to 13-9.
1Normal operation
1Check the pair number settings.
Judgment and action
Countermeasure