Coping With Remote Controller Abnormality - Mitsubishi Electric CITY MULTI PUHY-YMC Installation Manual

Displaying the service LED
Service LED (LD1)
• Error code display
Alternate display of error generating address and error code
Example At outdoor unit address 51, abnormal discharge temperature (Code 1102)
• Flag display
Example SV1 ON under only compressor 1 operated

12.4. Coping with remote controller abnormality

Phenomenon
Unit does not operate and
display stays off even after
pressing remote controller
ON switch.
1 (Current-carrying indicator
does not light up)
"HO" indicator does not dis-
appear. Unit does not oper-
ate even if the switch is
2 pressed.
Display comes on once but
3
disappears immediately after
a press of the switch.
CENTRALLY CONTROLLED
CHECK
˚C
STAND BY INDOOR UNIT
DEFROST ADDRESS NO
TEMP.
REMOTE CONTROLLER
PAR-F25MA
Cause
(1) Outdoor unit power was not turned on.
(2) Transmission or remote controller cable
was shorted or connection failure.
(3) Power cable contact failure
(4) Remote controller was erroneously con-
nected to unit remote controller termi-
nal block.
(5) Too many remote controllers or indoor
units were connected.
(1) No transmission cable was connected
to transmission cable terminal block on
the indoor unit.
(2) Outdoor unit address was erroneously
set
(3) Indoor unit address was erroneously
set.
(1) Indoor unit power was not turned on.
ON/OFF –
1Hr.
ON OFF ˚C
CLOCK
FILTER
CHECK MODE
ERROR CODE
TEST RUN A
NOT AVAILABLE
OA UNIT ADDRESS NO
CLOCK ON OFF
FILTER
CHECK
TIMER SET
TEST RUN
How to cope with abnormality
(a) Check voltage between remote controller terminals.
(i) Remote controller fails when voltage is 17 to 30 V.
(ii) If there is no voltage
• Check the number of remote controllers and indoor units con-
nected
• Remove wire from transmission cable terminal block (TB3) on
outdoor unit, and check voltage between terminals.
If voltage is 17 to 30 V, check (2) and (4) at left.
•
If there is no voltage, check (1) and (3) at left.
•
• Check all items at left.
• Check item at left.
ABCDEFGH
A Flag 1 E Flag 5
B Flag 2 F Flag 6
C Flag 3 G Flag 7
D Flag 4 H Flag 8
A Display: Appears when current is carried
37