Error code c-3421 in bizhub c220

Hi
The following site gives error codes for a wide range of printers and their user guides can be obtained as well.
Error Codes Konica Minolta bizhub C220 Code C3421
Your error comes up as follows:-
Code:- C3421
Description:- Fusing heaters trouble (Heating side)
• Detected temperature of the heating roller thermistor/C does not go up a given range of temperature even after a lapse of given period of time at warm up. • Detected temperature of the heating roller thermistor/C does not reach to a given temperature even after a lapse of given period of time after warm up is completed.
Remedy:- 1 Check the fusing unit for correct installation (whether it is secured in position). 2 Check the open/close operation of the right door. 3 Check the fusing unit, DCPU and PRCB for proper connection and correct or change as necessary. 4 Change fusing unit. 6 Change PRCB. 7 Change DCPU.
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Cheers