Tripp Lite SRCOOL33K, Service Manual

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11. Troubleshooting
11.1 Troubleshooting Table
Problem Possible Cause Solution
No power displayed on
panel or any one of the
buttons failure Power failure Check if the power supplier is supplying power to the unit. Check
the power cord and correct if damaged.
Transformer (discharge
transformer before testing) Check resistance between the two input/output lines on
transformer. Replace the transformer if either the input/output is
open or the transformer is damaged.
Display board or main PCB
failure Check the voltage on the display board. Replace the display
board if it is +5V. Otherwise, replace the main PCB.
Remote control failure
Battery failure Check the battery voltage. Replace batteries if the voltage is
lower than 2.3V.
Fan motor runs
intermittently Cycles on overload Check voltage. Call an electrician if not within limits.
Test capacitor. Replace if not /-10% of manufacturer's
rating.
Check bearings. Replace the motor if the blower wheel cannot
rotate freely.
Pay attention to any change from high speed to low speed.
Compressor stops
instantly after startup Refrigerant The amount of the refrigerant is too much, making the
compressor load too big. Recycle and recharge the refrigerant
after checking for the reason.
Compressor The compressor is blocked inside. Replace after checking for the
reason.
Fan motor will not run No power Check voltage at electrical outlet. Correct if none.
Water alarm Check and correct if water alarm happens.
Power supply cord Check voltage at the power cord terminal on Main PCB. Replace
the power cord if none.
Transformer (discharge
transformer before testing) Check resistance between the two input/output lines on
transformer. Replace the transformer if either the input/output is
open or the transformer is damaged.
Wire disconnected or
connection loose Connect wire. Refer to wiring diagram for terminal identification.
Repair or replace loose terminal.
Main PCB failure Select fan speed and check the voltage on main PCB. Replace
the main PCB if no voltage is present.
Capacitor (discharge capacitor
before testing) Test capacitor. Replace if not /-10% of manufacturer's
rating. Replace if shorted, open or damaged.
Will not rotate Fan blower hitting scroll. Realign assembly. Check fan motor
bearings. Replace the motor if motor shaft does not rotate.
Fan motor noise Fan blower Replace the fan blower if cracked, out of balance or partially
missing.
Loose screws Tighten screws accordingly.
Worn bearings Replace the motor if knocking sounds continue when running or
loose, or if the motor hums or noise appears to be internal while
running.
Compressor will not run
while fan motor runs Voltage Check voltage. Call your local utility if not within limits.
Wiring Check the wire connections. If loose, repair or replace the
terminal. If wires are off, refer to wiring diagram for identification
and replace. Check wire locations. If not per wiring diagram,
correct.
Main PCB failure Check voltage of main PCB. Replace the main PCB if open.
Capacitor (discharge capacitor
before testing) Check the capacitor. Replace if not /-10% of
manufacturer’s rating. Replace if shorted, open or damaged.