What causes fault code PKG-SEAL2 (Heat Seal / Impulse Seal Fault — Weak or Incomplete Seal)?

Seal bar temperature too low — heater element partially burned out or temperature controller failing. Seal bar surface contaminated — product residue on the seal bar preventing clean seal. Seal dwell time too short — jaw closing time insufficient for the film thickness. Film type changed — new film requires different temperature or pressure settings. Seal bar jaw pressure uneven — one side makes contact but the other doesn't

How do I fix fault code PKG-SEAL2?

Check seal bar temperature with a contact thermometer — compare to the setpoint on the controller. Clean seal bars and Teflon tape with a Teflon-safe cleaner — replace Teflon tape if burned or torn. Increase seal dwell time by 0.1-0.2 seconds and test seal integrity. Verify film specifications — check temperature range required for the current film type. Check jaw pressure alignment — shim or adjust jaw parallel to ensure even pressure across the full seal width. If heater element resistance has increased (partial burnout), replace the element — measure ohms and compare to spec

Heat Seal / Impulse Seal Fault — Weak or Incomplete Seal

PKG-SEAL2

Heat sealing or impulse sealing system producing weak, incomplete, or inconsistent seals. Product may leak or seal may fail during handling.

medium packaging

packaging heat seal impulse seal temperature film jaw

Probable Causes (ranked)

Seal bar temperature too low — heater element partially burned out or temperature controller failing
Seal bar surface contaminated — product residue on the seal bar preventing clean seal
Seal dwell time too short — jaw closing time insufficient for the film thickness
Film type changed — new film requires different temperature or pressure settings
Seal bar jaw pressure uneven — one side makes contact but the other doesn't

Fix Steps

1 Check seal bar temperature with a contact thermometer — compare to the setpoint on the controller
2 Clean seal bars and Teflon tape with a Teflon-safe cleaner — replace Teflon tape if burned or torn
3 Increase seal dwell time by 0.1-0.2 seconds and test seal integrity
4 Verify film specifications — check temperature range required for the current film type
5 Check jaw pressure alignment — shim or adjust jaw parallel to ensure even pressure across the full seal width
6 If heater element resistance has increased (partial burnout), replace the element — measure ohms and compare to spec

Field Trick

When seals are good on one end but bad on the other, the seal bar is not parallel. Stick a piece of carbon paper between the jaws and close them. The carbon impression shows you exactly where the jaws make contact and where they don't. Adjust until the impression is even across the full width.

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