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Curtis Code 28
Motor Temp Hot Cutback — controllers 1234 / 1236 / 1238

Possible causes (from the Curtis manual)

1. Motor temperature is at or above the programmed Temperature Hot setting, and the requested current is being cut back. 2. Motor Temperature Control Menu parameters are mis-tuned. 3. See Monitor menu » Motor: Temperature and » Inputs: Analog2. 4. If the application doesn’t use a motor thermistor, Temp Compensation and Temp Cutback should be programmed Off.

When it sets / how it clears

Set: Motor temperature is at or above the Temperature Hot parameter setting. Clear: Bring the motor temperature within range.

Effect of the fault

Reduced drive torque.

Curtis 1234/1236/1238 controllers are fitted to many electric forklifts and industrial trucks (including models from Chinese brands that use Curtis control). If your display shows code 28 with a Curtis controller, this entry applies; the vehicle maker’s manual may add model-specific notes.

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For controller, contactor, sensor or throttle parts, send us the code (Curtis 28), controller model and vehicle model on WhatsApp — we quote genuine and OEM parts for export.

Source: Curtis 1234/36/38 Controller Manual, OS 11, Section 8 Diagnostics & Troubleshooting, Table 5. Compiled 2026-10-29. No affiliation with Curtis Instruments.