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Unknown and unwanted vibrations and/or noises are coming from the test chamber.
Jan 11, 2018

This occurs when the circulation fan motor is running rough. 

Check these possible causes and solutions:

The unit's fan blade is unbalanced or damaged.

→ Add balance weights or replace damaged fan blade.

The fan motor shaft has bent.

→ Replace the fan motor and blade.

The fan shaft is rubbing or the fan blade is hitting.

→ Center the fan motor and provide sufficient running clearance for the fan blade.

The fan motor bracket is loose.

→ Tighten the motor mounting screws.

There is moisture on the fan blade.

→ Heat up the test chamber.

CO2 "snow" is on the fan blade.

→ Heat up the test chamber.