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941

MOTOR THERMOSTAT FAULT

Otis · DSD 412 Elevator System

Was bedeutet 941 ?

This fault indicates that the DSD 412 drive has detected an open motor thermostat circuit, specifically between terminals A4TB3(2) and A4TB3(8). This condition does not automatically shut down the drive but is annunciated via the ALARM relay output K2.

Häufige Ursachen

  • The motor thermostat is open due to overheating or a circuit break.
  • If the thermostat contact point is closed but the fault persists, there may be a problem with the power supply.

Reparaturschritte & Checkliste

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

  1. 1

    Check the motor thermostat between terminals A4TB3(2) and A4TB3(8) for an open circuit.

  2. 2

    If the thermostat contact point is confirmed to be closed but the fault is still present, replace the power supply.

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Verifizierte technische Daten. Zuletzt aktualisiert: March 2026

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