Toshiba RAS-2M21U2ACVG-SG Service Manual page 76

Check Outdoor
code LED display
∗ There is a possibility that it is one of the following errors.
[21]
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.
 
*
:ON ( *:3 sec ON / 0.5 sec OFF) :OFF
(Item without special mention indicates part of outdoor unit.)
[High pressure SW system error]
High pressure protective operation.
Doesn't high pressure switch
operate?
YES
Are parts of
high pressure switch normal?
YES
Is service valve fully opened?
YES
Reset the power supply and
then do a trial operation according
to the season.
B Cooling operation.
Does cooling outdoor fan
normally operate?
YES
Is there any element
which blocks heat exchanger
of the outdoor unit?
Clogging of heat exchanger
Short circuit
NO
- 76 -
Check and troubleshooting
NO
Is circuit wiring normal?
NO
Parts check
Defective → Replace
NO
Open service valve fully.
B ← Cooling operation
NO
Is there no fan breakage
or coming-off?
YES
YES
Overcharge of refrigerant/
Clogging/Pipe breakage/
NO
Wiring check,
Correct.
YES
Check IPDU PC board
Defective → Replace
NO
Repair defective position.
Connection of connectors,
IPDU, Fan motor, Wiring.
Elimination of
blocking element
Abnormal overload