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E537 is a Fuser Unit error, it most likely requires replacing but first try a few simple checks. Lift the scanner unit upwards out of the way and open the top rear cover to expose the fuser unit. Check that it is seated properly and that both "latches" are in the locked position. Try unlocking them and removing/reseating the fuser (there is a small plastic hinged piece on the L/H side of the printer that needs lifting to allow removal). If all of this fails you will need to replace the fuser unit. A google search should turn up a stockist in your area as they are listed as consumable items.
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E537 is listed as FUSER FAIL:
? Control Thermistor detected a temperature exceeding the specified temperature.
Safety Thermistor detected a temperature exceeding the specified temperature.
? The Control Thermistor did not detect a Ready even though the specified time elapsed from Main Lamp ON at Warm Up.
? The Main Lamp continues to stay lit even after time specified for the Main Lamp elapsed after the Control Thermistor detected a
? The Control Thermistor detected a temperature below the specified temperature even after the specified time elapsed from Main
Lamp ON at Warm Up.
? The latch lever of FUSER ASSY is set incorrectly.
You should replace the fuser unit. If the error remain after changing the fuser you need to take the machine for service as the error may relate to the power supply units.