APM
All alarm codes
ALARM 28F

Emergency Stop (28 F)

Chip conveyor was originally fitted but is now unplugged — its E-stop loop is open. Any unplugged peripheral that was in the safety chain (bar feeder, foot p...

Controls
T-2
Machine series
Quick Turn

Causes

  1. Chip conveyor was originally fitted but is now unplugged — its E-stop loop is open. Any unplugged peripheral that was in the safety chain (bar feeder, foot pedal, cooling fan, conveyor) leaves the loop open at power-up.

    • (thread reply)forum
      If the machine sported a bar feeder before, that estop circuit could also be open. Hook up bf or make sure jumper is installed to bridge out rhat line.

  2. Machine has been sitting for over a week — the turret position is uncertain at power-up and the safety circuit latches on E-stop. Indexing the turret right when the 'ready' light comes on clears it.

    • kevin66forum
      We have an old QT20 universal with T1 control. If it sits for a week or more it will give us this alarm. Try to index the turret as soon as the "ready" light comes on when powering up the lathe.it has always worked for u…

How to clear it

  1. 1

    If the machine sits between uses: power up, watch for the READY light, then immediately index the turret one position. That has cleared 28F repeatedly on at least one QT20.

    • kevin66forum
      Try to index the turret as soon as the "ready" light comes on when powering up the lathe.it has always worked for us.
  2. 2

    If 28F is there from power-up and never goes away: hook up (or jumper out) any peripheral that was originally part of the safety chain — chip conveyor, bar feeder, foot pedal, cooling fan.

Confidence: medium · Multiple causes confirmed by separate operators in the same thread; one (kevin66) reports the turret-index trick 'has always worked for us'. OP did not post final resolution.

First sourced: 5/21/2026