Head OpenPM42

Fix Head Open Error on Honeywell PM42 Printer

The Head Open error on the Honeywell PM42 signifies that the printhead assembly is not securely locked. This safety feature prevents printing when the head is not properly positioned against the platen roller. Resolving this is typically straightforward.

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Common causes

  • 1The printhead lever is not fully locked down.
  • 2Foreign objects are obstructing the head mechanism.
  • 3Worn or misaligned sensor actuator.

Solutions

Mechanical Reset

  1. Lift the printhead lever completely.
  2. Ensure no media or debris is trapped under the printhead.
  3. Close the lever firmly until it clicks into the locked position.

Sensor Check

  1. Inspect the small sensor near the printhead latch.
  2. Use a soft brush to remove dust if the sensor looks blocked.

Steps to follow

  1. 1

    Unlock

    Open the printer head lever fully.

  2. 2

    Check area

    Remove any obstructions or label buildup.

  3. 3

    Secure

    Push the lever down firmly until it locks.

Frequently asked questions

Check for debris around the latch that might prevent a full seal.

It is unlikely, as this is a safety switch issue, not a printhead element issue.

No, the head sensor is a simple mechanical switch that is either open or closed.