The machine has not reached temerature in time which is down to either the heater lamp has blown or the thermal fuse. Press a series of buttons to reset - Cancel / Interupt / 0 / Interupt / 14 / Print button.
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U2 40 is a CRUM comunication error with the toner (wrong toner chip on toner cartridge or wrong toner cartridge) try a new toner.
H4 is a fuser trouble code. Check to make sure all conection are right, Theres a few posible problems for H4, power board, MCU board, thermistor, or broken heat lamp.