E-401: Fan vibration trip

Q: How do I check a E-401 fault?

1. Isolate and lock out fan 2. Inspect blades and pitch 3. Check gearbox oil and mounting bolts Safety: Lock out fans before entry; use respiratory protection near drift.

Probable causes

Blade imbalance or damage
Loose mounting
Gearbox wear

Step-by-step checks

Isolate and lock out fan
Inspect blades and pitch
Check gearbox oil and mounting bolts

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-401 mean on a Cooling Tower?

E-401 usually indicates: Fan vibration trip. Confirm the meaning in the manufacturer's manual for your model.

What causes E-401?

Blade imbalance or damage; Loose mounting; Gearbox wear.

How do I check a E-401 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.