Description: Fusing-temperature range violation (too low)
During paper transport, fusing temperature fell below lower limit (155°C) and remained below limit for 6 seconds.
Description: Standby temperature error 1
Fusing temperature failed to drop to expected level within a given time (15 seconds, 15 minutes, or 25 minutes, depending on mode) after entering standby or low-power mode.
Causes: • TRIAC short • Fan not running
Code: 551
Description: Standby overheat
Temperature during standby or low-power mode remained too high for a specified interval (10 seconds or 25 seconds, depending on the mode).
Causes: • TRIAC short
Code: 552
Description: Standby low temperature error
After reaching expected temperature in low-power mode (level 1) or standby mode, temperature fell and remained below 155°C for 20 seconds.