Question about Motorola MU21CV (1 Channel) 2-Way Radio

1 Answer

It appears that my mike on one unit does not work.

The codes and chanels match but one of the units can not be heard as though the mike does not work. Can I solve or trouble shoot?

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  • cottons84 Mar 04, 2009

    I had already done the code and frequency check. They match. No obstructions as well.

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  • Motorola Master
  • 1,641 Answers

Check your programming by holding in the PTT button while turning on the radio. The first announced number is your frequency. Press the MONITOR button, and then it will announce your code. Press the MONITOR button again finish. Then shut the radio off and back on for normal operations.

If the numbers on your radios do not match, you can use your PTT button to change the number it has announced. Press the MONITOR button to lock in your new setting after setting the frequency and/or code.

Final thought, check your mic hole on the face of the radio to be certain is does not have debris or tape over it.

Posted on Mar 04, 2009

  • eradiostore
    eradiostore Mar 04, 2009

    If the freq/code match, and the mic hole is not blocked, your radio is in need of repair. (Sorry) Motorola no longer supports this model at the repair facility. You would need to take or send the radio to a repair center. (As a sidenote: If you do not have a servicer in your area we do offer a flat rate of $69.)

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panasonic error codes-xt1cn2hhaugflni22i0hbhn0-4-1.png

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1. Timer LED start to blink and the unit automatically stops the operation.
2. Press the CHECK button on the remote controller continuously for 5 seconds.
3. "- -" will be displayed on the remote controller display. Note: Display only for "- -". (No transmitting signal, no receiving sound and no Power LED blinking.)
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• In operation after breakdown repair, the Timer LED will no
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• To make a diagnosis:
1. Timer LED start to blink and the unit automatically
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2. Press the CHECK button on the remote controller
continuously for 5 seconds.
3. "- -" will be displayed on the remote controller display.
Note: Display only for "- -". (No transmitting signal, no
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4. Press the "TIMER" or button on the remote
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6. When the latest abnormality code on the main unit
and code transmitted from the remote controller are
matched, power LED will light up for 30 seconds and
a beep sound (continuously for 4 seconds) will be
heard. If no codes are matched, power LED will light
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• To make a diagnosis
1. Timer LED start to blink and the unit automatically stops the operation.
2. Press the CHECK button on the remote controller continuously for 5 seconds.
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7. The breakdown diagnosis mode will be canceled by pressing the CHECK button continuously for 5 seconds or without any operation the remote control for 30 seconds.
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2. Press the CHECK button on the remote controller continuously for 5 seconds.
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Hi I have a panasonic split air conditioner. It turns itself off immediately after turning on, the timer button then flashes and that's all.... I have checked for an error code it is H00. I have also made...


Hi Tania,
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  • Once error occurred during operation, the unit will stop its operation, and Timer LED blinks.
  • Although Timer LED goes off when power supply is turned off, if the unit is operated under a breakdown condition, the LED will ON again.
  • In operation after breakdown repair, the Timer LED will not blink. The last error code (abnormality) will be stored
    in IC memory.
14.2.2 To Make a Diagnosis

  1. 1 Timer LED starts to blink and the unit automatically stops the operation.
  2. 2 Press the CHECK button on the remote control continuously for 5 seconds.
  3. 3 "- -" will be displayed on the remote control display.
    Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
  4. 4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed and signal will be transmit to the main unit.
  5. 5 Each press of the button (? or ?) will increase error code number and transmit error code signal to the main unit.
  6. 6 When the latest abnormality code on the main unit and code
    transmitted from the remote control are matched, Power LED will
    light up for 30 seconds and a "beep" sound (continuously for 4
    seconds) will be heard. If no codes are matched, Power LED will light up for 0.5 seconds and no sound will be heard.
  7. 7 The breakdown diagnosis mode will be canceled unless pressing the CHECK button continuously for 5 seconds or operating the unit for 30 seconds.
  8. 8 The LED will be off if the unit is turned off or the RESET button on the main unit is pressed.
14.2.3 To Display Memorized Error Code (Protective Operation)
  1. 1 Turn power on.
  2. 2 Press the CHECK button on the remote control
  3. 3 "- -" will be displayed on the remote control display. Note: Display only for "- -" (No signal transmission, no receiving sound and no Power LED blinking)
  4. 4 Press the TIMER ? or ? button on the remote control. The code "H00" (no abnormality) will be displayed
    and signal will be transmit to the main unit.
  5. 5 Each press of the button (? or ?) will increase error code number and transmit error code signal to the main
    unit.
  6. 6 When the latest abnormality code on the main unit and code transmitted from the remote control are matched,
    Power LED will light up for 30 seconds and a "beep" sound (continuously for 4 seconds) will be heard. If no
    codes are matched, Power LED will light up for 0.5 seconds and no sound will be heard.
  7. 7 The breakdown diagnosis mode will be canceled unless pressing the CHECK button continuously for 5
    seconds or operating the unit for 30 seconds.
  8. 8 The same diagnosis can be repeated by turning power on again.
14.2.4 To Clear Memorized Error Code after Repair (Protective Operation)

  1. 1 Turn power on (in standby condition).
  2. 2 Press the AUTO button for 5 seconds (a "beep" sound is heard) on the main unit to operate the unit at Forced Cooling Operation Mode.
  3. 3 Press the CHECK button on the remote control for about 1 second with a pointed object to transmit signal to
    main unit. A "beep" sound is heard, and the Error Code is cleared

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