Toyotomi Toyoset NS-2800, Service Manual, Page: 17 / 47

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3-7. Power Failure Recovery
When an electric power failure occurs while the heater is in operation, all electrical
systems will be automatically shut off. When the power is restored, the heater
automatically reignites and operates.
3-8. Overheat Recovery
The heater is protected against damage resulting from an overheat condition by 90°C
(195°F) automatic reset thermostat (overheat protector switch).
In the event of an overheat, the overheat protector is triggered to shut the heater off.
STEP 1: Turn the heater off to cool down the heater.
STEP 2: Be sure that the heater is cool to the touch. A period of 30 to 40 minutes
should be sufficient to permit the heater to cool completely.
STEP 3: Check for the reason for overheating. Overheating is usually caused by
objects that impede free air circulation. Look for debris and other obstructions
near the heated air outlet and at the flue pipe top just outside of the dwelling.
3-9. Automatic Cleaning Cycle
The heater will automatically perform a self burner cleaning when the heater operates
continuously for five (5) hours. During the self cleaning cycle, the heater stops for two (2)
minutes and automatically restarts.