Troubleshooting - USA Lab UHC Series User Manual

6.2 Troubleshooting

Problem
B. No power supplied from outlet.
No power C. Outlet has power, unit does not.
E. Power randomly turns off.
Temperature
display is B. Temperature probe has a short.
incorrect
Temperature
display not
working B. Display cable loose or broken.
correctly or
flashing
Shock from the
B. An electrical component has
shell of the unit
B. Condenser fan not spinning.
C. Compressor won't turn on.
Not cooling
D. Compressor is louder than
A. Compressor stopped running.
B. Condenser fan running slowly.
Cooling slowly D. Capillary or refrigerant clogged.
F. Load is greater than the unit can
Not heating
A. Temperature set too high (glycol
Boiling /
Smoking
B. Heating not increased slowly.
Cause
A. Not plugged in.
D. Breaker tripped.
A. Probe wire is loose.
C. Main board has failed.
A. Incorrect power supply.
C. Display board has failed.
A. System ground fault.
failed.
A. Cooling not enabled.
normal, bad.
E. Refrigerant leaked out.
C. Incorrect glycol ratio.
E. Liquid pump not primed.
handle.
A. Heating not enabled.
B. Heating won't turn on.
only)
Solution
A. Plug unit in.
B. Reset breaker in the front panel or at
service panel.
C. Verify no power at circuit breaker in front
panel.
D. Reset breaker in the front panel or at
service panel.
E. Check screws inside of the plug, tighten if
necessary.
A. Tighten probe. Refer to T1 or T2 on the
main board diagram.
B. Replace temperature probe.
C. Replace main board.
A. Supply the correct power to the unit.
B. Re-seat or replace the display cable.
C. Replace the display board.
A. Repair fault to ground.
B. Contact us for further troubleshooting.
A. Enable cooling.
B. Clean condenser and replace the fan.
C. Check the relay and the start capacitor.
D. Check the windings for a short to ground.
E. Contact us for further troubleshooting.
A. Wait for compressor delay to end.
B. Replace condenser fan.
C. Change the fluid to the correct ratio.
D. Contact us for further troubleshooting.
E. Re-prime the liquid pump.
F. Reduce the load on the unit.
A. Enable heating.
B. Check the relay and the over temperature
safety dial.
A. Reduce temperature below 110°C or switch
to silicone oil.
B. Increase the temperature slowly by 5°C
increments.
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