Error code SC542 on a Ricoh 3245

Hello, this code is : Fusing temp. warming-up error. This means that the fuser did not warm-up in the allowed time. Possible causing-- in order; Thermistor bad or out of position,
fuser lamp bad,
thermofuse bad,
BICU board defective,
power supply board bad,
poor fusing unit connection ----check this first if you had the fuser out of the machine.

If you would like to talk, I can see if we can try to reset the code -- sometimes if the machine is to cold at warm-up the code will throw. # 216-701-1591. Thank you.