Case Thermo Operation, Power Supply Error; Short-Circuit Of Compressor Drive Element; Position Detection Circuit Error; Current Detection Circuit Error - Toshiba RAS-4M27U2AVG-E Service Manual

Check Outdoor
code LED display
*

[1C]
* *
[14]
  
** *
[16] 
* 
[17]
:ON ( *:3 sec ON / 0.5 sec OFF) :OFF
(Item without special mention indicates part of outdoor unit.)

[Case thermo operation, Power supply error ]

Is AC mains voltage correct?
(198 to 264V)
YES
Are CN609 of P.C. board MCC-1571
connection and case thermostat correct?
YES
Short each pins of CN609.
Can compressor operate?
YES
Is there gas leak?
Is there refrigerant shortage?
NO
Is service valve fully opened?
YES
Is PMV under correct conditions?
YES

[Short-circuit of compressor drive element]

Are connections of
compressor lead and reactor correct?
(Check referring to the Wiring diagram.)
YES
Does the same error occur in operation
without compressor lead?
NO

[Position detection circuit error]

Check outdoor P.C.B MCC-1571.
Defect → Replace.

[Current detection circuit error]

Check outdoor P.C.B MCC-1571.
Defect → Replace.
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Check and troubleshooting
NO
NO
Case thermostat error → Replace.
NO
Check outdoor P.C.B MCC-1571.
YES
NO
NO
Defect → Correct and Replace.
NO
YES
Replace outdoor P.C.B MCC-1571.
Check compressor. (Rare short, etc.)
FILE NO. SVM-18052
Confirm power supply
construction. etc.
Correct connector.
Defect → Replace.
Repair defective position.
Recharge refrigerant.
Open service valve fully.
Correct defective position.
Replace defective part.
Check crushed or broken pipe.
Correct wiring.
Defect → Replace.