This is an error code for slow warm up you should pull the fuser out and check the thermistors and condition of the rollers. sometimes the thermistors get caked in toner so they cant read the temps correct. if you take the unit apart you should be able to detect the toner build up. a soft clothe and some WD40 may be able to clean it off but be ccareful as too rough may clip ther resistor off.
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