Free English TOSHIBA CARRIER MMY-MUP1921HT6P-UL (01) PDF document. Download the PDF, use the online viewer, or browse the FAQs for easy troubleshooting.
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What are the steps for the fan check during a test operation for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
To perform a fan check on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL, follow these steps:
1. Push the Start/Stop button on the remote controller.
2. Select the Fan operating mode.
3. Verify if air is discharged from the discharge port of the indoor unit. If no air is discharged, check the indoor fan, fan motor, and fan circuit.
4. Check if the operating sound is normal. If abnormal sounds are detected, check the positions around the fan.
5. If a check code appears on the remote controller, refer to the troubleshooting section to eliminate the cause of the trouble.
6. Repeat this check for every indoor unit in the system.
How do I perform a cooling or heating test operation for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL using a wired remote controller?
The cooling and heating test operation for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL can be started and stopped using the following procedure:
1. Push the TEST button for 4 seconds or more. TEST will be displayed in the display section and the unit will enter test operating mode.
2. Push the ON/OFF button.
3. Use the Select Mode button to choose either the COOL or HEAT operating mode. Do not use any other operating mode during this test.
4. Note that temperature adjustment is unavailable during test operation and troubles are detected as usual.
5. When the test operation is finished, push the ON/OFF button again to stop the operation.
6. Push the TEST button to clear the test operating mode. TEST should disappear from the display section and the status should return to normal stopped status.
What are the check items for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL before powering on the unit?
Before powering on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL, ensure the following items are checked:
| Main check items |
| Are the indoor and outdoor communication lines of the header unit connected to the U1/U2 (Uv) terminals? |
| Is the communication line between outdoor units connected to the U5/U6 (Uc) terminal? |
| Is the header unit setting (SW101-bit 1) turned on? |
| Is the terminator resistor (SW100-bit 2) on the interface PC board of the header unit turned on? |
| Is the end terminal of the shield wire earthed? |
How is the automatic address setup performed on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
Automatic address setup for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL is conducted via the header outdoor unit interface P.C. board:
1. Turn on the indoor units first, followed by the outdoor units.
2. Wait approximately 1 minute and confirm the 7-segment display on the header outdoor unit interface P.C. board indicates U. 1. Err and L08 alternately at 1 second intervals.
3. Push SW06 on the interface board for more than 1 second to start the automatic address setting. This process typically takes about 5 minutes but can take up to 10 minutes.
4. The 7-segment display will cycle through Auto 1, Auto 2, and Auto 3.
5. The setup is complete when the display changes to U. 1. – – – (flashing or light).
6. Repeat the process for any other refrigerant lines if applicable.
What are the common indoor unit check codes and their typical problem sites for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
The following check codes may appear on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL system:
| Check Code | Typical Problem Site | Description |
| E03 | Indoor-remote controller | Communication from remote controller or network adaptor has been lost. |
| E04 | Indoor-outdoor communication | Signals are not being received from outdoor unit. |
| E08 | Duplicated indoor address | Indoor unit detects an address identical to its own. |
| F01 | Indoor heat exchanger sensor (TCJ) | TCJ sensor has been open-short-circuited. |
| F10 | Room air temperature sensor (TA) | Room air temperature sensor has been open-short-circuited. |
| L03 | Indoor group header unit | There is more than one header unit in the group. |
| P10 | Indoor overflow trouble | Float switch has been activated. |
| P12 | Indoor DC fan trouble | Indoor DC fan trouble such as overcurrent or lock-up is detected. |
How do I set up Night Operation for sound reduction on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
To configure Night Operation for sound reduction on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL using the RBC-AWSU remote controller:
1. Push the Menu button.
2. Use the arrow buttons to select 6. Night operation on the menu screen and push the Set button.
3. Select 1. Night operation on the Night operation screen.
4. Use the arrow buttons to select ON and push the Set button.
5. To set the specific operation time, select 2. Start time or 3. End time from the menu and use the arrow buttons to adjust the clock settings. Push Set to save each change.
6. Push the Menu button to return to the main menu screen.
What is the interpretation of the oil level judgment results on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
When checking the oil level status via the 7-segment display on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL, the digits represent the following:
| Displayed Digit | Judgment Result | Description |
| 0 | Normal | The amount of oil in the compressor is sufficient. |
| 1 | Low level | The amount of oil in the compressor is insufficient. |
| 2 | Low level | The amount of oil in the compressor is insufficient. If this persists, the system will initiate a protective shutdown. |
Example display: [oL] [ 0 0 … ] indicates that the oil level is normal for both compressor 1 and compressor 2.
How can check codes be cleared in the outdoor unit of the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
To clear a currently detected check code on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL outdoor unit using the interface board switches:
1. Set the rotary switches SW01, SW02, and SW03 to [2/16/1].
2. Push the push-switch SW04 for 5 seconds or more.
3. Confirm that CL is displayed in the 7-segment display [B] for 5 seconds, indicating the check code is completely cleared.
4. After clearing, return the rotary switches to the default [1/1/1] position.
What is the procedure for manual address setup from the remote controller for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
If manual address setup is required for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL using the RBC-AMT remote controller, use this procedure:
1. Arrange one indoor unit and one remote controller in a 1-by-1 setup.
2. Turn on the power.
3. Push the SET, CL, and TEST buttons simultaneously for 4 seconds or more until the LCD begins blinking.
4. Set the Refrigerant Line Address: Use the TEMP buttons to set DN code to 12. Use the TIME buttons to set the line address (matching the outdoor header unit). Push SET.
5. Set the Indoor Address: Use TEMP buttons to set DN code to 13. Use TIME buttons to set the indoor address. Push SET.
6. Set the Group Address: Use TEMP buttons to set DN code to 14. Use TIME buttons to set Individual (0000), Header (0001), or Follower (0002). Push SET.
7. Set the Central Control Address: Use TEMP buttons to set DN code to 03. Use TIME buttons to set the central control address. Push SET.
8. Push the TEST button to finish the setup. Setting up will blink and then go off when operation is possible.
What are the criteria for the temperature difference between suction and discharge during cooling for the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
For the TOSHIBA CARRIER MMY-MUP1921HT6P-UL, a cooling operation is considered normal if, after operating for a minimum of 30 minutes in COOL mode, the dry bulb temperature difference between the suction air and discharge air of the indoor unit is 46.4 degrees Fahrenheit (8 degrees Celsius) or more.
How do I adjust the Outdoor Fan High Static Pressure Shift on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL?
To enable the Outdoor Fan High Static Pressure Operation on the TOSHIBA CARRIER MMY-MUP1921HT6P-UL, which allows for duct installations with up to 0.32 inWG (80Pa) external static pressure:
1. Change the outdoor DN code O.DN [19] from 0000 (Normal) to 0001 (High Static Pressure Operation).
2. This function must be enabled on every outdoor unit (both header and follower units) that has a discharge duct connected.
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