Check
code
Outdoor
LED display
Check and troubleshooting
(Item without special mention indicates part of outdoor unit.)
[21]
∗
There is a possibility that it is one of the following errors.
Confirm LED on
display
P.C. board
(MCC-1646)
to judge which error it is. (1) high-pressure SW system error,
(2) power supply error (Vdc), (3) high-pressure protective operation, (4) case thermo operation.
Repair defective position.
Is circuit wiring normal?
Is there no fan breakage
or coming-off?
Is service valve fully opened?
Does cooling outdoor fan
normally operate?
B Cooling operation.
B
←
Cooling operation
Doesn’t high pressure switch
operate?
Are parts of
high pressure switch normal?
Reset the power supply and
then do a trial operation according
to the season.
Is there any element
which blocks heat exchanger
of the outdoor unit?
Clogging of heat exchanger
Short circuit
Parts check
Defective
→
Replace
Elimination of
blocking element
Check IPDU PC board
Defective
→
Replace
Wiring check,
Correct.
Open service valve fully.
Overcharge of refrigerant/
Clogging/Pipe breakage/
Abnormal overload
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
NO
[High pressure SW system error]
High pressure protective operation
.
Connection of connectors,
IPDU, Fan motor, Wiring.
*
{
{
:ON
(
{
*:3 sec ON / 0.5 sec OFF)
z
:OFF
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