Thermo King Alarm 84

The Thermo King Alarm 84 in Spanish has the following characteristics:

Alarm Code 84 Thermo King

• Status: Green = OK
• Null Restart
• Report the alarm at the end of the day

Let’s begin by stating that many times, the main code is 17, but the equipment displays code 84 when attempting to restart. Therefore, we must also discuss code 17.

1. Code 17 Generation:
   • Generated if the engine does not reach 40 RPM or goes above and then falls below 40 RPM during the engine start sequence.
   • This alarm is set as a preventive alarm.
2. Shutdown Alarm:
   • Two attempts to start are made, and then the alarm code 17 “Engine Failed to Crank” is set as a shutdown alarm.
3. Alarm Following Code 20/84:
   • A code 17 following a Code 20/84 “Error Starting” will be set as a shutdown alarm.
4. Check RPM:
   • Use an independent tachometer (photo or stroboscopic light) to verify the engine RPM and compare it with the values indicated by the controller.

Code 84 Thermo King in Spanish – What You Should Know First:

• Error 84 is just an alert to report the problem at the end of the day.
• Try to reset the codes once the load has cooled completely, then run it to see if the problems return.
• If they do, you may have a cooling problem. Check that the condenser fan is working, the system is fully charged with refrigerant, and there are no air leaks in the trailer.

The Thermo King Alarm 84:

• It is a temporary abnormal condition resulting from other alarms.
• The unit shuts down for about 15 minutes.
• The unit will restart after about 15 minutes, or after the condition has been reset, and in most cases, other alarms will have been cleared.
• If after 3 attempts, the condition still occurs, the alarm that caused the shutdown will appear on the screen, and the unit will shut down until the alarm is cleared.
• Code 84 is automatically cleared after the last restart attempt.

Solution for Code 84:

• This alarm occurs if the engine fails to start and run when required.
• The error code is generated when the charging current falls below predetermined limits for a period.
• If the AC current signal frequency from the alternator to the microprocessor falls below a predetermined limit.

What to Do with Alarm Code 84:

1. Verify the power contactor.
2. Check the power source.
3. Using a multimeter, check the alternator’s operation.
4. Check the tension of the drive belts.
5. Check the output amperes on the screen if the unit uses the current bypass.

What to Do with Alarm 84 and the Control Panel:

• This alarm is automatically cleared if the original condition does not recur.
• Indicates that the microprocessor is taking corrective action due to the appearance of shutdown alarm codes 9, 10, 17, 18, 19, 20, 23, 24, 35, 40, 41, 42, 44, or 63, and then attempting a restart to keep the unit running.
• Many of these actions include a “waiting period” (to allow the engine to cool, a high-pressure condition).
• If the corrective action is successful, the original alarm code, as well as Alarm Code 84, are automatically cleared.
• If the initial alarm condition persists, and the corrective measures taken by the microprocessor are unsuccessful, the original alarm code remains.