4. Alignment and Troubleshooting
Service Manual
ML-331x/371x series
4-38
Samsung Electronics
● Code
U1-2320
● Error message
Error #U1-2320 Turn off then on.
● Symptom / Cause
The temperature control of fuser unit is abnormal. (Open Heat Error)
● Troubleshooting method
1. Turn the machine off. Re-install the fuser unit.
Then turn the machine on. Is the error message is disappeared?
2. If the problem persists, turn the machine off and remove the fuser unit.
Check if the fuser connector is connected properly.
Check if the input voltage is normal.
● Code
U1-2330
● Error message
Error #U1-2330 Turn off then on.
● Symptom / Cause
The temperature control of fuser unit is abnormal. (Low Heat Error)
● Troubleshooting method
1. Turn the machine off. Re-install the fuser unit.
Then turn the machine on. Is the error message is disappeared?
2. If the problem persists, turn the machine off and remove the fuser unit.
a. Check if the fuser connector is connected properly.
b. Check if the input voltage is normal.
c. Check if the thermistor is twisted or contaminated.
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