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8. TROUBLESHOOTING
Troubleshooting Guide
Symptom Possible
Causes/Solutions
Unit will not power on.
Power cable is not connected properly or securely.
Power failure in progress.
Main power switch (ELB) is “OFF”
Delay timer is actuated
Refrigeration system does not operate
with the REFRIG switch ON
Confirm whether unit has just completed defrost function. If
so, turn switch OFF and restart.
Temperature does not fall.
Cooling fins are clogged with dust or debris.
Too many samples are being processed at once.
External temperature exceeds 30°C.
Cooling
vent(s)
are obstructed.
Voltage from power supply is insufficient. Refer to “8.
Connect to a proper power supply” (P.6).
Ice in cold trap does not melt with
DEFROST engaged.
External temperature is too low (below 5°C).
DEFROST button pressed with REFRIG switch OFF.
Ice not melted entirely – defrost is an auxiliary function
intended to separate ice from inner wall to facilitate removal.
This function will not completely melt ice accumulated in cold
trap.
Error lamps
Error Symptom
Cause
Remedy
Refrigeration
error lamp on
“----“ in display
Refrigeration system
overload
Turn power off immediately, eliminate error source
(refer to “temperature does not fall” above) and
restart after approximately 5 minutes.
If lamp stays lit after restart, Contact a local dealer or
Yamato sales office.
Temperature sensor
interruption or
disconnection.
Contact a local dealer or Yamato sales office for
assistance.
After power outage
DC801 units reset automatically to where operation halted before power loss and resumes
operation when power is restored. When defrosting, the refrigeration system will turn back on
after power is restored. Press the defrost button once again to resume defrosting.
If conditions for resuming operation are unfavorable, turn OFF the power switch (ELB) when
power outage occurs.
If problem does not fall under any of errors above, turn off power immediately, disconnect power cable
and contact a local dealer or Yamato sales office for assistance.
Summary of Contents for DC801
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