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Troubleshooting Guide
Safety
Self-diagnostic Circuitry
The Yamato sterilizer was designed with self-diagnostic circuitry capable of monitoring operation of
the sterilizer. If a malfunction occurs, the display panel blinks the error code and an alarm is sounded.
The microprocessor disables power to the heater element. If this occurs, check the error code and
immediately shut off the main breaker.
The safety valve is activated if pressure inside the chamber is abnormal. No special alarm is given
when the safety valve is activated. However, a significant amount of steam will spout out of the louvers
or spaces on the exterior. In this situation, there can be some problems such as an air purge or
problems with the temperature controller. Push the “ENTER” key immediately to stop the operation.
Turn off the main breaker after the steam spouting out settles down.
Error Code List
Indication
Cause
Alarm in emergency
Quick measure
Final measure
Sensor-related
trouble
Display and buzzer
Disconnected heater
circuit
Exchange sensor etc.,
Triac-related
trouble
Display and buzzer
Disconnected heater
circuit
Exchange triac
etc.,
Heater-related
trouble
Display and buzzer
Disconnected heater
circuit
Exchange heater
etc.,
Main relay-related
trouble
Display and buzzer
Disconnected heater
circuit
Exchange relay
etc.,
Run-down of
back-up battery
Display and buzzer
The unit stays stand-by
condition.
Turn on the breaker
and charge the battery
Heating low water
Display and buzzer
Disconnected heater
circuit
Supply water
In case of power failure
If the main circuit breaker is turned off during operation or main power is temporally interrupted
during operation.
1
．
The sterilzier will remain in the state it was disabled at. A power failure will result in the
chamber remaining pressurized if it was under pressure at the time of the failure.
2
．
When power is restored the operation program is lost and the solenoid exhaust valve will
remain closed until the chamber temperature is below boiling point.
Do not open the lid in this situation or hot and high pressure steam will spout out.
If you want to open the lid, use the pressure relief switch to reduce pressure inside the chamber
to “0psi”.
