Panasonic KX-FL513RU Service Manual page 191

2. Safety Protection
a. 2 thermostats are provided with the unit, and the heater circuit is shut down when their surface temperatures became over
135°C.
b. The heater control circuit of IC606 has the built-in function that the software turns off the heater control automatically if the
heater is not turned ON every a fixed time.
c. When the temperature became over 240°C, the heater control circuit of IC606 is turned off forcedly and system reset (IC606
pin 20 becomes Low) will be executed.
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