Heater

Heating System Not Heating

Otis · 400 Elevator

What does Heater mean?

Indicates that the heating system is not heating at a rate of 0.5º C per hour or better while active. This suggests a performance issue with the heating system, potentially impacting product temperature control.

Common Causes

  • Heater element malfunction.
  • Faulty thermostat or temperature control circuit.
  • Wiring issue in the heating circuit.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the supply voltage to the heating system at its input terminals.

  2. 2

    Check the controller's output signal to the heating element for activation when heating is commanded.

  3. 3

    Verify the temperature sensor's reading accuracy against an independent reference thermometer at the measured location.

  4. 4

    Measure the electrical resistance of the heating element to confirm continuity and compare against manufacturer specifications.

Browse all codes in this manual (41)
Verified technical data. Last updated: March 2026

Related Faults