Toshiba MMU-AP0121MH - Manual (Page 57)

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MG-SW : Magnet Switch, OCR : Over-current Relay
Check item (position)
• Check TK1 sensor coming-off.
• Check characteristics of TK1 sensor resistance value.
• Check TK1, TK2, TK3, and TK4 misconnection.
• Check operation error of SV3E valve.
• Check capillary clogging of oil-equation circuit and operation error
of stop valve.
• Check refrigerant stagnation in compressor.
• Check MG-SW or OCR.
• Check TK2 sensor coming-off.
• Check characteristics of TK2 sensor resistance value.
• Check TK1, TK2, TK3, and TK4 misconnection.
• Check SV3E valve operation.
• Check capillary clogging of oil equalization circuit and check stop
valve operation.
• Check refrigerant stagnation in compressor shell.
• Check MG-SW or OCR.
• Check TK3 sensor coming-off.
• Check characteristics of TK3 sensor resistance value.
• Check TK1, TK2, TK3, and TK4 misconnection.
• Check SV3E valve operation.
• Check capillary clogging of oil-equalization circuit and check valve
operation.
• Check refrigerant stagnation in compressor shell.
• Check MG-SW or OCR.
• Check TK4 sensor coming-off.
• Check characteristics of TK4 sensor resistance value.
• Check TK1, TK2, TK3, and TK4 misconnection.
• Check SV3E valve operation.
• Check capillary clogging of oil-equalization circuit and check valve
operation.
• Check refrigerant stagnation in compressor shell.
• Check MG-SW or OCR.
• Check indoor address.
• Check the change of remote controller connection
(Group/individual) after indoor address setup.
• Check line address.
• Check display of indoor unit with priority.
Check code
Main
remote
controller
H16
L03
L04
L05
Outdoor 7-segment display
Check code
H16
—
L04
—
Auxiliary code
01: TK1 oil circuit system error
02: TK2 oil circuit system error
03: TK3 oil circuit system error
04: TK4 oil circuit system error
—
—
—
Detected
position
I/F
Indoor
I/F
I/F
Check code name
Oil level detective circuit system error
MG-SW error
OCR operation
Duplicated indoor center units
Duplicated outdoor line address
Duplicated indoor units with priority
(Displayed on indoor unit with priority)
Status
All stop
Corresponding
unit only stops.
All stop
All stop
Error detection condition
Temperature change of TK1 could not be
detected though compressor 1 started
the operation.
Temperature change of TK2 could not be
detected though compressor 2 started
the operation.
Temperature change of TK3 could not be
detected though compressor started the
operation.
Temperature change of TK4 could not be
detected though compressor started the
operation, or the difference from other TK
sensor changed for a constant time only
within the specified range.
There are multiple center units in a group.
Line address setup is duplicated against
the outdoor unit in different refrigerant
pipe system.
Indoor units with priority were duplicated.