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9. TROUBLESHOOTING
Error Indications and Descriptions
Symptom
Error message
Possible causes
Possible measures
Boiler drain error
Boiler Water
Waste Error
Service Call
If the heater operation
water level is entered
ON after the
abnormality
determination time has
passed from the start of
boiler drain.
Contact original dealer of
purchase
Cooling water
failure
A Coolant Error
Service Call
When the boiler
overflow input of float
cylinder keeps ON for
longer than the
abnormality
determination time.
Contact original dealer of
purchase
Boiler water
level error
Boiler Water
Level Error
Service Call
If the heater operation
water level is entered
OFF after the
abnormality
determination time has
passed from the start of
water supply to boiler.
Contact original dealer of
purchase
Boiler water
level gauge
failure
Boiler Water
Sensor Error
Service Call
When float contact
points in float cylinder
are in an abnormal
state.
Replace float switch.
* When an abnormality occurs or an error message appears, heater, solenoid valves and all the other
controls are shut off.
* In the event of malfunction, confirm the message on screen and contact original dealer of purchase or
Yamato sales office.