Panasonic UF-580 Service Manual page 44

Fuser Error Detection
( C)
200
180
170
160
150
70
25
14
Approx. 30 sec
E26 will be logged.
E24 will be logged if Thermistor detects 180 C
for more than 3 sec. (Thermostat will open.)
OFF
165
155
E24 will be logged if
Thermistor detects less
than 140 C for 3 sec during
the print process.
E22 will be logged when
temperature does not rise.
E25 will be logged when
temperature does not go up
at low temperature
environment.
Time
44
E23 will be logged if Thermistor
detects 175 C or higher for 5 min.
after Fuser Lamp is turned Off.