E-404: Fan motor overload

Q: How do I check a E-404 fault?

1. Check blade pitch against design 2. Measure motor current 3. Inspect bearings after isolation Safety: Lock out fans before entry; use respiratory protection near drift.

Probable causes

Blade pitch too high
Low voltage
Bearing failure

Step-by-step checks

Check blade pitch against design
Measure motor current
Inspect bearings after isolation

Safety: Lock out fans before entry; use respiratory protection near drift.

Sample code — verify with the OEM manual for your exact model.

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Frequently asked questions

What does E-404 mean on a Cooling Tower?

E-404 usually indicates: Fan motor overload. Confirm the meaning in the manufacturer's manual for your model.

What causes E-404?

Blade pitch too high; Low voltage; Bearing failure.

How do I check a E-404 fault?

Work through the numbered checks above in order, recording readings as you go. Lock out fans before entry; use respiratory protection near drift.

Other Cooling Tower codes

Disclaimer: Fault code information is guidance only. Codes and meanings vary between manufacturers and models — always follow the manufacturer's manual and your site's safety procedures, and use qualified personnel for electrical, pressure, refrigerant and combustion work.