3-10. When the Following Symptoms are Found
Check the points described below before asking repair servicing.
Check again.
It is not a failure.
| Symptom | | | Cause | |
| Outdoor unit | • White misty cold air | • Fan of the outdoor unit stops automatically and performs defrost | |
| |
| | or water is out. | | | operation. | |
| | • Sometimes, noise | • Solenoid valve works when defrost operation starts or finishes. | |
| | “Pushu !” is heard. | | | |
| | | |
| Indoor unit | • “Swish” sound is | • When the operation has started, during the operation, or immediately |
| | heard sometimes. | | after the operation has stopped, a sound such as water flows may be |
| | | | | heard, and the operation sound may become larger for 2 or 3 minutes |
| | | | | immediately after the operation has started. They are flowing sound of |
| | | | | refrigerant or draining sound of dehumidifier. | |
| | • Slight “Pishi!” sound | • This is sound generated when heat exchanger, etc. expand and | |
| | is heard. | | | contract slightly due to change of temperature. | |
| | • Discharge air smells. | • | Various smell such as one of wall, carpet, clothes, cigarette, or | |
| | | | | cosmetics adhere to the air conditioner. | |
| | • The operation lamp | • Flashes when power is turned on again after power failure, or when |
| | flashes | | | power switch is turned on. | |
| | • “STANDBY | ” | • When cooling operation cannot be performed because another indoor |
| | indication is lit. | | | unit performs heating operation. | |
| | | | • When the manager of the air conditioner has fixed the operation to |
| | | | | COOL or HEAT, and an operation contrary to the setup operation is |
| | | | | performed. | |
| | | | • When fan operation stopped to prevent discharge of hot air. | |
| | • Sound or cool air is | • | Since refrigerant is flowed temporarily to prevent stay of oil or | |
| | output from the | | refrigerant in the stand by indoor unit, sound of flowing refrigerant, |
| | stand by indoor unit. | | “Kyururu” or “Shaa” may be heard or white steam when other indoor |
| | | | | unit operates in HEAT mode, and cold air in COOL mode may be |
| | | | | blow-out. | |
| | • When power of the | • Sound is generated when the expansion valve operates when power |
| | air conditioner is | | has been turned on. | |
| | turned on, “Ticktock” | | | |
| | sound is heard. | | | |
| Operates or stops automatically. | | • Is the timer “ON” or “OFF”? | |
| | | | | |
| Does not operate. | | • | Is it a power failure? | |
| | | | • Is the power switch turned off? | |
| | | | • Is the power fuse or breaker blown? | |
| | | | • Has the protective device operated? (The operation lamp goes on.) |
| | | | • Is the timer “ON”? (The operation lamp goes on.) | |
| | | | • Are COOL and HEAT selected simultaneously? (“STANDBY | ” |
| | | | | indication is lit on the display column of the remote controller.) | |
| | | | |
| Air is not cooled | or warmed sufficiently. | • | Is the suction port or discharge port of the outdoor unit obstructed? |
| | | | • Are any door or window open? | |
| | | | • | Is the air filter clogged with dust? | |
| | It’s strange. | | • | Is discharge flap of the indoor unit set at appropriate position? | |
| | | | • Is air selection set to “LOW” “MED.”, and is the operation mode set to |
| | | | | “FAN”? | |
| | | | • Is the setup temp. the appropriate temperature? | |
| | | | • Are COOL and HEAT selected simultaneously? (“STANDBY | ” |
| | | | | indication is lit on the display column of the remote controller.) | |
| | | | | | |
When the following symptoms are found, stop the operation immediately, turn off the power switch, and contact the dealer which you have purchased the air conditioner.
•Activation of switch is unstable.
•Fuse or breaker is blown periodically.
•Foreign matters or water entered by mistake.
•When if activation cause of the protective device has been removed, the operation is not performed.
•Other unusual status occurred.
Compact 4-Way Air Discharge Cassette Type
Contents
Safety Caution
Metal section Earth position
Check the following items after reinstallation
Catch the inner cables
Fire is caused at user’s side
Flare nut
Safety Caution Concerned to New Refrigerant
Pipe Materials
Piping
General tools Conventional tools can be used
R410A Conventional air Air conditioner installation
Conditioner installation
Tools
Cylinder with siphon
Recharge of Refrigerant
Environment
4mm-hexagonal wrench is required
Drain-up standing-up size
Space required for Installation and servicing
Wired remote
Construction Views External Views
Control P.C. board
Wiring Diagram
For Indoor unit
MCC-1402
Model
Parts Rating
Parts Rating
Name of Each Part
Display section
Parts Name of Remote Controller
Wind direction and Swing
Remote controller sensor
Operation section
Button
Stop
Turn on the main power switch and/or the leakage breaker
Correct Usage
Preparation
When restarting the operation after stop
Automatic Operation Super Heat Recovery Type Only
Start
To select SET Time
Timer Operation
Timer operation
Cancel of timer operation
How to stop swinging
Adjustment of Wind Direction
How to set up the air direction
How to start swinging
Information
Air Conditioner Operations and Performance
Standby
When the Following Symptoms are Found
Connect all of the installation wiring correctly
Precautions for Safety
New Refrigerant Air Conditioner Installation
To Disconnect the Appliance from Main Power Supply
Installable ceiling height list
Selection of Installation Place
Installation space
Installation space
Case of wireless type
Installation of Indoor Unit
Dimensional view
Installation of remote controller Sold separately
Ceiling opening and installation of hanging bolts
Installation of ceiling panel Sold separately
Installation of hanging bolt
Drain Piping Work
Permissible pipe length and permissible height difference
Piping material and dimensions
Refrigerant Piping
Thermal insulating process
Open fully valves of the outdoor unit Gas leak check
Electric Work
Connection of refrigerant pipe
Airtight test/Air purge, etc
Remote controller wiring *4
Power supply specifications
Indoor unit power supply *1
Indoor/Outdoor inter-unit wiring, Central controller wiring
Applicable Controls
Increased heating effect
Case of installation to high ceiling
Case of remote controller-less Group control
Change of lighting time of filter sign
Test RUN
How to execute test operation
Case of wireless remote controller
Case of wired remote controller
Confirmation and check Check method
Troubleshooting
Confirmation of error history
Check code list
Error detected by TCC-LINK central control device
Troubleshooting
Way Air Discharge Cassette Type
Maintenance
Daily maintenance
New check code
Functional part name Functional outline
Refrigerating Cycle Diagram
Control Outline
Control Specifications
Outline of specifications Remarks
Remote controller Control outline Command
Value
Reset conditions
TCB-AX21E
Central control mode
Central control mode 1 Cannot operate
Central control mode 4 Cannot select mode
Applied Control
Procedure Execute the setup operation while the unit stops
HEAT, Heat → Cool
Description At shipment
Indoor unit capacity
Applied Control in Indoor Unit
Remote location ON/OFF control box TCB-IFCB-4E
Operation
Ventilating fan control from remote controller
Wiring
Function
Leaving-ON prevention control
Power peak-cut from indoor unit
Using the setup temp
Button, set to the setup data
Troubleshooting procedure
Troubleshooting
Troubleshooting Summary
Before troubleshooting
Judging device
Check code list
Check Method
Auxiliary code
Sensor block display
MG-SW
Check code Outdoor 7-segment display Auxiliary code
Error detected by TCC-LINK central control device
Check code
Procedure Description
Troubleshooting by Check Display on Remote Controller
Case of wired remote controller RBC-AMT31E
Confirmation of error history
Case of central remote controller TCB-SC642TLE
Remote
Check code
Outdoor 7-segment display
Check code Auxiliary code
Convenient functions
Setup method of No. capacity-over Detection
Check code
Main Outdoor 7-segment display Remote
Detected
Main Outdoor 7-segment display
Check code Auxiliary code
Remote
Check item position
Remote Check code
Detected Main
Status Error detection condition Check item position
Position Remote
Check clogging of oil equation pipe between compressors
Check code Main Outdoor 7-segment display
H07
Check all the outdoor units in the corresponding line
H16
Check code Main Outdoor 7-segment display Remote
L30 Detected indoor address L31
P01 P03 P04
Name
TS error judgment standard temperature
Heating
Remote Check code Auxiliary code
Outdoor 7-segment display Check code name
Error detection condition Check item position
Central control
Outdoor 7-segment display Detected position
Device Check code
Display on
Measured position Criteria
How to check inverter output
How to check resistance of compressor winding
How to check the outdoor fan motor
E02
Diagnosis Procedure for Each Check Code
E03
E04
E07
E06 Decreased number of indoor units
E09 Duplicated master
E08
E12
E15
Reference
E16
E18
E19
E25
∗ 1 How to clear the error
E20
E23
F03
E31
F01
F02
F08 To sensor error
F04 TD1 sensor error
F05 TD2 sensor error
F06 TE1 sensor error
F23
F29 Indoor other error
F15 Outdoor temp sensor miscabling
TE1, TL
H03
F31
H02
H01
H06 Low-pressure protective operation
Clogging for SV3E valve
Leakage check for SV3C valve
Clogging check for SV3D valve
H08
Clogging check for oil-equalization circuit
TK3 temperature detective circuit error
Oil level detective circuit system error
L03
H16 TK4 temperature detective circuit error
L04
L05
L08
L07 Group line in individual indoor unit
L10
L17
L28
L18
L29
L20
L31
P01 Indoor fan motor error
L30 Interlock in indoor unit
P03
Auxiliary code Compressor 1 side
P05 Open phase, negative phase
P04 Actuation
High-pressure SW
P12
P07 Heat sink overheat error
P10 Indoor overflow error
Indoor fan motor error
TS condition Auxiliary code
P13 Outdoor liquid back detection error 1. PMV1/PMV2 error
P15
Gas leak detection
TD condition Auxiliary code
Discharge temp TD2 error
P15 Gas leak detection
P17
P20 High-pressure protective operation
P19 Way valve operation error
Judgment criteria
Auxiliary code 0 ∗
P22 Outdoor fan Ipdu error
P31
P26 Tr short-circuit protection error
Detective circuit error
P29
Segment display on the outdoor unit Interface P.C. board
Check procedure in case of stop with trouble
How to read the check monitor Segment display
Segment Display Function
SW01 SW02 SW03 Display contents
There is auxiliary code Check code ∗ ∗ ∗ for 3 seconds
SW03 SW02 Indoor address Segment display a
Data display of outdoor cycle Displayed on each outdoor unit
Segment display A, B
Sensor Characteristics
Temperature sensor characteristics
W01 SW02 SW03 Display contents Segment display
Indoor Unit
Configuration of Control Circuit
Wired remote controller Up to 2 units
Weekly timer
Kit
Connection of wireless remote controller
Compact 4-way Air Discharge Cassette Type
Compact4-way Air Discharge Connection of both remote
Wireless
Cassette Type Controller
Remote
Cassette
Air Discharge
Type
MCC-1402 Compact 4-way
Function Connector Pin Specifications Remarks
Optional Connector Specifications of Indoor P.C. Board
Attachment
Part name Procedure Remarks
Detachments
Preparing work
100
101
No. Part name Procedure Remarks
102
Bell mouth 1. Detachment
No. Part name Procedure
103
Fan guard 1. Detachment
Fan motor 1. Detachment
104
Drain pump 1. Detachment
105
Details of a part
Details of sensor lead wire drawing
106
Arrow view B
107
Exchanger Recover refrigerant gas
Heat
108
10. P.C. Board Exchange Procedures
Exchange of P.C. Board for Indoor Service
Exchange procedure
Remote controller operation diagram
Procedure 1 Readout setup contents from Eeprom
110
Procedure 2 Exchange of P.C. board for service
Eeprom layout
Procedure 3 Writing-in of setup contents to Eeprom
Make a note of the setup contents. Item code list Example
Description
Exploded Views and Parts List
Ceiling Panel
113
114
Compact 4-way Air Discharge Cassette Type
MMU-AP0071MH, AP0091MH, AP0121MH, AP0151MH, AP0181MH
211
Description Remarks Model Name
115
0071MH 0091MH 0121MH 0151MH 0181MH
Description Model Name
116
Toshiba Carrier Corporation