310C332dn

Fixing Fuser Thermistor Error 310 on OKI C332dn

Error code 310 on the OKI C332dn printer indicates that the main thermistor circuit in the fuser assembly is reporting an open circuit. The mainboard cannot read the fuser's temperature, locking the printer for safety.

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Common causes

  • 1Damaged or broken thermistor wiring inside the fuser.
  • 2Poor contact connection between the fuser assembly and the printer chassis.
  • 3Tripped thermal fuse due to localized overheating.
  • 4Faulty low-voltage power supply board or fuser control circuit.

Solutions

Repairing Error Code 310

This is a hardware-based temperature sensing issue. Perform the following diagnostic checks:

Method 1: Clean and Check Fuser Connector Blocks

  1. Shut off the printer completely and unplug the power cord.
  2. Open the upper cover and wait at least 25 minutes for the fuser to cool down.
  3. Pull the two blue tabs back and lift the fuser out.
  4. Locate the male connector block on the bottom side of the fuser and the female housing inside the printer.
  5. Use a dry microfiber cloth or cotton swab to clean away any paper dust or grease on these copper connector points.
  6. Slide the fuser back into place, ensuring it is locked flat and even.

Method 2: Fuser Voltage and Regional Match

Ensure you are using the correct replacement fuser version. Installing a 115V fuser into a 230V machine, or vice versa, will cause immediate thermistor readings failures and trigger Error 310.

Steps to follow

  1. 1

    Power Off and Cool

    Switch off power, disconnect from the outlet, and let the unit cool for 25 minutes.

  2. 2

    Clean Connection Contacts

    Inspect the multi-pin connector on the fuser and the printer's receiver. Wipe off dust and realign any bent contacts.

  3. 3

    Install a New Fuser Unit

    If connections are sound but error 310 persists, replace the fuser unit as the thermistor has failed internally.

Frequently asked questions

Generally, no. Unlike some other brands, the OKI C332dn checks the physical electrical resistance of the thermistor. If the circuit is broken, no software reset will fix it.

Not necessarily. Error 310 specifically points to the sensor (thermistor) circuit, though a severely failed heating lamp can also trigger this.