Image runner 5020 will not print or copy

I use canon ir 5020i it is problem
1. heater not hot
2. show "reservation copy canbe made
3. how must IP boad

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Hello Ernest T,
If the main thermistor which monitors the temperature of the fusing unit (that hot as hell area) is out of postion this problem can occur. The thermistor determines when the fusing area is hot enough to allow the copier to display"READY". If it is backed away from the fuser roller it cannot reliably read the temperature and it may cause the copier to display suspended because it reacting as if because of a long copy run it could not keep up the temp and so it "suspends" as it tries to ramp the temperature back up. Make sure the thermistor is touching the fuser roller.