Teco AC Error Codes and Troubleshooting



The faults that the GA7200 detects are classified into faults and alarms.

If a problem occurs, the fault contact is output and the motor coasts to a stop. When an alarm is issued, the digital operator indicates the alarm for warning.

Teco AC Error Codes and Troubleshooting
Teco AC Error Codes and Troubleshooting
Error CodesFault Display-Description
Uu1Undervoltage(CUV). Two seconds are counted after detection of low voltage.
Uu2Undervoltage(CUV). Control circuit becomes low voltage during operation.
Uu3Undervoltage(MC-AND fault). Main circuit magnetic contactor does not operate correctly.
OFGrounding. Grounding current - approx. %50 of inverter rated current.
oCOvercurrent. Inv. out current > %200 of Inv. rated current.
ouOvervoltage. Increase decel time and/or add braking resistor.
FUFuse blown. Check short-circuit at load, ground fault, etc.
oHRadiation fin overheated. Check fan or ambient temperature.
oL1Overload. Protect the motor.
oL2Overload. Protect the inverter.
oL3Overtorque. When selecting inv. output OFF at inv.output current. overtorque level and overtorque detection.
rrRegenerative transistor fault. Replace transistor.
rHBraking resistor overheated. Protect braking resistor incorperated in inverter unit.
EF3Control circuit terminal.
EF5Control circuit terminal.
EF6Control circuit terminal.
EF7Control circuit terminal.
EF8Control circuit terminal.
bU5Communication inverter card SC-C communication.
CPF00Operator communication error.
CPF01Operator communication error.
CPF02Control circuit fault.
CPF03NV-PAM (S-RAM) fault.
CPF04NV-RAM (BCC,Access Code) fault.
CPF05A/D converter fault in CPU.
CPF06Optional connection fault.
Teco AC inverter Fault Codes
Teco AC inverter Fault Codes

Troubleshooting

Issue: Unit does not turn on when pressing ON/OFF button

Possible Causes: The Unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot be restarted within three minutes of being turned off.




Issue: The unit changes from COOL/HEAT mode to FAN mode

Possible Causes:

  • The unit may change its setting to prevent frost from forming on the unit. Once the temperature increases, the unit will start operating in the previously selected mode again.
  • The set temperature has been reached, at which point the unit turns off the compressor. The unit will continue operating when the temperature fluctuates again.

Issue: The indoor unit emits white mist

Possible Causes: In humid regions, a large temperature difference between the room’s air and the conditioned air can cause white mist.

Issue: Both the indoor and outdoor units emit white mist

Possible Causes: When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process.

Issue: The indoor unit makes noises

Possible Causes:

  • A rushing air sound may occur when the louvre resets its position.
  • A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit’s plastic parts

Issue: Both the indoor unit and outdoor unit make noises

Possible Causes:

  • Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units.
  • Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant gas stopping or changing direction.
  • Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises.

Issue: The outdoor unit makes noises




Possible Causes: The unit will make different sounds based on its current operating mode.

Issue: Dust is emitted from either the indoor or outdoor unit

Possible Causes: The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity.

Issue: The unit emits a bad odor

Possible Causes:

  • The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations.
  • The unit’s filters have become moldy and should be cleaned.

Cleaning Your Air Filter

Teco AC Cleaning Your Air Filter
Teco AC Cleaning Your Air Filter

A clogged air conditioner can reduce the cooling efficiency of your unit, and can also be bad for your health. Make sure to clean the filter once every two weeks.

1. The air filter is under the top air inlet grill.

2. Grip the tab on the end of the filter, lift it up,then pull it towards yourself.

3. If your filter has a small air freshening filter, unclip it from the larger filter. Clean this air freshening filter with a hand-held vacuum.

4 Clean the large air filter with warm, soapy water. Be sure to use a mild detergent.

5. Rinse the filter with fresh water, then shake off excess water.

6. Dry it in a cool, dry place, and refrain from exposing it to direct sunlight.

7. When dry, re-clip the air freshening filter to the larger filter, then slide it back into the indoor unit.

Teco AC Remote Control
Teco AC Remote Control

Air Filter Cleaning Reminder



After 240 hours of use, the display window on the indoor unit will flash “CL” This is a reminder to clean your filter. After 15 seconds, the unit will revert to its previous display. To reset the reminder, press the LED button on your remote control 4 times, or press the MANUAL CONTROL button 3 times. If you don’t reset the reminder, the “CL” indicator will flash again when you restart the unit.

Air Filter Replacement Reminder

After 2,880 hours of use, the display window on the indoor unit will flash “nF” This is a reminder to replace your filter. After 15 seconds, the unit will revert to its previous display. To reset the reminder, press the LED button on your remote control 4 times, or press the MANUAL CONTROL button 3 times. If you don’t reset the reminder, the “nF” indicator will flash again when you restart the unit.

Models:
TWS-TSO26H3DVEM
TWS-TSO37H3DVEM
TWS-TSO53H3DVEM
TWS-TSO72H3DVEM
TWS-TSO81H3DVEM

Teco Air Conditioner Manual PDF




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