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It does have a thermal safety and it very well could be the problem. I
looked up this review for you. I hope it is what you were looking for.
Many recommend you plug the heater in and turn it on in a well-ventilated room (like a garage) for the few hours of use. If you are using the heater to warm a room, plug it in with the thermostat set to maximum and set the power selector to 3 until the room reaches the desired temperature. Then rotate the thermostat clockwise until you hear a click. You can set the power level to 1 or 2 to conserve energy while maintaining the current temperature settings.
If you are trying to avoid frozen pipes in an area, plug in the heater and set the power selector to 3 and thermostat to *.
Always remember to keep anything flammable away from the heater (loose drapes etc.) There is an overheating protection circuit built into the unit. To reset it, you need to call the DeLonghi service center.
This unit is equipped with a thermostat which controls the temperature of the room by turning the heater on and off. The heater is protected with a safety device to prevent overheating. Should the heater overheat, an automatic cut out will turn the heater off and it will not come back on without being reset. It can be reset by switching the Main On/Off Switch to off and waiting five (5) minutes before switching the unit back on."
C-3451 on the bizhub range indicates Heat. Heater Trouble. This is not resettable in the normal manner. To reset, turn machine off (switch insde front door, bottom left) Turn back on, but hold down the UTILITY button while doing so. Keep UTILITY pressed until you get a message on the display saying 'trouble reset'. Remove minger from UTILITY and touch 'trouble reset'. Now turn the machine off again, same switch as before. Turn back on normally and see if it warms up and you get a green button. I have had a few machines do this code for no apparent reason. I've had others which required a new fuser unit. Hope yours is the former. Good luck
Once the heater is installed and the whirlpool pump is operating, the heater is totally automatic. The heater will help maintain the temperature of the water in the bath. The heater is equipped with a preset pressure switch. The pump must be running with water flowing in the whirlpool to allow the heater to turn on. The Indicator Light light turns on whenever the heater is operating. The heater includes an exclusive "Intelligent High-Limit". This safety circuit will not "false trip" from hot tap water. It will only turn the heater off if the thermostat fails. If the high-limit trips frequently, call a service technician. To manually reset the circuit in the event that the "High-Limit" switch has been activated, simply (1) Turn off the whirlpool pump. (2) Drain water from the tub. (3) Remove power from heater by unplugging at receptacle or turning off circuit breaker. (4) The heater circuit will automatically reset in less than 15 minutes. (5) Restore power to the heater. (6) Whirlpool bath is now ready to use.
Unscrew the four screws holding the front faceplate on (two are on the bottom of the radiator). From the bottom end gently pry up the faceplate, it will stay attached at the top end near the temperature selector. Look inside and you will see a black bridge like piece of metal with a plastic and metal thing stuck to it's center with two wires leading into it. It's basically a connection that melts when high temperatures are reached, therefore it must be replaced (pictured). You can bypass this by prying the metal bridge out, removing the wires leads from the switch and connecting them using a wire nut. BE AWARE THAT THIS WILL OVERRIDE THE HIGH TEMPERATURE SHUT OFF MECHANISM, so don't use it for drying off your coat again.