Service manual: TAC-12D-10
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● Self-test
To enter the self-test function, press the SET button and ▲ button for 5 seconds and
release.
Self test steps:
1 - LED scanning 3 seconds
2 - Internal Fan -- seconds (running all the time)
3 - Heating 30 seconds
(Heater)
4 - Cooling 60 seconds
(Compressor and external fan)
5 - External fan 10 seconds
When the self test is completed, controller will automatically exit. During self-testing, you
can press the EXT button to exit.
6. Maintenance
6.1 Trouble Shooting
The air conditioners are designed for trouble free life as long as the inlet filter is
maintained in a clean condition. To aid in service definition the service personnel can
initially identify probable cause by referring to the following trouble shooting chart.
Problem Potential Cause Solution
No Power
Check power source and
electrical connections
Fuse Blown on Control Board
Replace with 3.15A slow blow
fuse
Unit not running
Faulty Control components Replace control board
Filter clogged Clean or replace filter
Blocked evaporator or
condenser coil
Clean coil
Evaporator or condenser fan
not operating
Replace motor, capacitor or
entire assembly
Unit not cooling
sufficiently
Loss of refrigerant or oil leaks
Return to Telca or locate and
repair leak
Insufficient heat load or unit
oversized for application
Contact Telca
Ice on evaporator coil
Failed evaporator fan
Replace evaporator fan motor
or assembly
Condensate draining
continuously
Enclosure not properly
sealed
Check and seal all openings
Defective fan motor or wheel
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