Toshiba RAS-3M18S3AV-E Service Manual page 91

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
C
Heating operation
Does the heating indoor fan
normally operate?
YES
Is there any element which
blocks indoor heat exchanger?
Filter clogging
Clogging of heat exchanger
Short circuit
NO
Clogging by refrigerant
overcharge/Pipe breakage/
Abnormal overload
Check indoor P.C. board
Defective → Replace
- 91 -
Check and troubleshooting
NO
Is circuit wiring normal?
NO
Parts check
Defective → Replace
NO
Open service valve fully.
B ← Cooling operation
C ← Heating operation
NO
Is there no fan breakage
or coming-off?
YES
YES
Overcharge of refrigerant/
Clogging/Pipe breakage/
NO
Are connections of
connectors,capacitors
and fan motor normal?
YES
YES
Elimination of
blocking element
Are characteristics
of TC and TCJ sensor
resistance value normal?
YES
FILE NO. SVM-15102
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
NO
Repair
defective position.
NO
Replace
TC or TCJ sensor.