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Chea what the manual says: [url=https://printcopy.info/?L=en&mod=pc&brand=OKI&model=B401&page=1] Exploded views and free parts list! [/Url] Code173 Description Unit moisture error of the low temperature fuser of the upper heater. Turn off the power and wait a moment. And then turn on the power. Remedy Is the thermistor connector normally inserted into the THERM connector on the main board? • No Insert the thermistor connector correctly. • Yes Is the heater connector normally inserted into the CN201 connector of the low voltage power. • No Insert the heater connector properly. • Yes Is the heater ON when the power is turned on? • No Replace the fuser unit assembly, low voltage power or main board. • Yes Replace the uni Assy fuser or main board.