Trouble Shooting - Yamato DNF 400 Instruction Manual

Trouble Shooting

Refer to page 59 "Safety Device and Error Code" for the state of unit at activation of safety device and
corrective actions.
Problem
The sub indicator does not
indicate current date and time
when the electric leakage
breaker is turned on.
The operation panel indicates
none when the power key is
pressed.
Temperature does not rise.
Temperature is slow in rising
Instable indication
of temperature
• Please consult your retailer or any of our branch offices for the corrective actions with "*" mark or that
other than listed above.
If power failure occurs...
The unit returns automatically to start operation automatically with the same condition as just
before the failure when it occurs during operation and is recovered. It, however, is dangerous
that the unit starts unmanned operation automatically. We recommend to turn off the switch at
power failure
Possible Cause
Power is not supplied.
Earth leakage breaker failure.
Controller failure.
Problem in power source.
Controller failure.
Damper is opened.
The safety device in independent overheating
prevention device or self-diagnosis function is
activated and the heater circuit is shut off
(error code indication).
Damper is opened.
Too much samples loaded.
Controller failure.
Temperature sensor failure.
Variable ambient temperature.
Effect of sample.
Controller failure.
Temperature sensor failure.
61
In the Event of Failure...
Solution
Check power connection and
turn on electricity.
Replace the breaker (*)
Replace the controller (*)
Connect to the appropriate
power source.
Replace the controller (*)
Close the damper.
Refer to page 59 "Safety
Device and Error Code".
Close the damper.
Refer to the item 6 and 7 on
page 6.
Replace the controller. (*)
Replace the sensor (*).
Refer to the item 2 on page
4.
Refer to the item 6 and 7 on
page 6.
Replace the controller. (*)
Replace the sensor (*).