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What This Error Means

This error indicates a problem with the printer's fuser unit, often related to incorrect temperature readings or a failure to reach the proper operating temperature.

Detailed Explanation

Error code 117.370 on Canon printers typically points to an issue within the fuser assembly, which is a critical component responsible for bonding toner to the paper using heat and pressure. The printer's internal diagnostics have detected that the fuser is either not reaching its required operating temperature within a specified timeframe, or its temperature sensor is reporting an out-of-range value. This can be caused by a failing fuser lamp, a faulty thermistor (temperature sensor), a problem with the fuser's power supply, or even an internal control board malfunction. Without the fuser operating correctly, the toner will not be permanently fixed to the paper, resulting in smudged or blank prints. The printer's safety mechanisms prevent operation when this error occurs to avoid potential damage to the unit or fire hazards. While sometimes a simple power cycle can resolve a transient sensor reading, persistent occurrences suggest a more significant hardware failure within the fuser assembly itself.

DIY Troubleshooting Steps

Try these steps before calling a specialist

1
Perform a complete power cycle: Turn off the printer using its main power switch, unplug it from the wall outlet, wait for at least 5-10 minutes, then plug it back in and power it on. This can reset internal sensors.
2
Check the printer's environment: Ensure the printer is in a well-ventilated area, not directly exposed to extreme cold or heat, and that no vents are blocked. Extreme ambient temperatures can affect fuser warm-up times.
3
Verify power supply: Make sure the printer is plugged directly into a wall outlet, not a surge protector or extension cord, which can sometimes limit power delivery.
4
Inspect for obstructions: While not directly related to fuser temperature, sometimes a paper jam or foreign object near the fuser area can indirectly affect its operation or sensor readings. Carefully open all access panels and look for anything unusual.
5
Allow printer to cool down: If the printer has been running continuously for a long period, turn it off and let it cool completely for an hour or more before attempting to restart.
6
Update printer firmware: Check the Canon support website for your specific model to see if there are any available firmware updates. Sometimes, software glitches can cause misreadings or control issues.
7
Attempt a fuser reset (if applicable): Some Canon models have a service mode or a specific sequence to reset components. Consult your printer's service manual or Canon support for model-specific instructions, but proceed with caution as incorrect procedures can cause further issues.

When to Call a Specialist

You should contact a qualified printer technician or Canon service center if the error persists after performing all the DIY troubleshooting steps, especially after a full power cycle. This error almost always indicates a hardware failure within the fuser unit, such as a burnt-out fuser lamp, a defective thermistor, or a faulty fuser drive circuit. These components are not user-serviceable and require specialized tools and expertise to diagnose and replace safely. Attempting to repair the fuser yourself can be dangerous due to high temperatures and electrical components, and may void your printer's warranty.

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CANON Error Code 117.370