Toyotomi LC-43 Instruction Manual page 12

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Temperature within the heater too high.
Power interrupted. You can re-ignite the heater.
Thermostat is broken or disconnected. Contact your dealer.
Faulty burner thermistor. Contact your dealer.
Primary flame rod is malfunctioning and /or dirty.
You have accidentaly activated your safety tip-over switch. You
should reset this device as described, press the "OFF" button and
restart your heater.
Burner flame has been extinguished during operation. Check to
see if air filter is clogged with dust. If so, clean air filter.
Room temperature above 32°C
Failure of blower motor.
Air filter dirty; or Fuel pump dirty.
The heater has been in operation continuously for a period of 69
hours and has turned itself off automatically. Switch the heater
back on.