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There is a problem with the fuser unit , H2 means thermistor open or not connected, H4 means low temperature or fuser lamp not working. Reset with by pressing ; # , Interrupt , C , Interrupt. Display will go off then enter 14 and press Print key.
H2-0 Fusing unit temperature error
H4-0 The fusing unit doesn't heat up.
***ALWAYS DISCONNECT POWER WHEN WORKING
ON MACHINE*** You have to reset fuser errors with simulation
14. SM 5-1 should turn the lamp on. If lamp blinks on and off it
is the thermistor, if it does not it is the lamp, but check the
contacts on the lamp/fuser -- they have been known to erode.
Also check thermal fuse, if defective
An H2 is an indicator that the temperature sensing device is reading open, preventing the machine to warm up. There is only one way to correct this and that is to replace the thermistor, and that takes a technician. Not a hard job but a novice could get into trouble and make matters worse.