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
Verify the supply voltage to the heating system at its input terminals.
- 2
Check the controller's output signal to the heating element for activation when heating is commanded.
- 3
Verify the temperature sensor's reading accuracy against an independent reference thermometer at the measured location.
- 4
Measure the electrical resistance of the heating element to confirm continuity and compare against manufacturer specifications.
Verified technical data. Last updated: March 2026
Related Faults
Source: Otis 400 Elevator