Overheating / shuts down on the BenQ TH685

Source: ProductDB new-categories research catalog Confidence: 90% Verified Aug 8, 2026

The projector overheats and shuts down, usually from a blocked air filter or a failing cooling fan.

How to fix Overheating / shuts down

Clean the air filter

Remove and clean the air filter to restore airflow.

Source: ProductDB new-categories research catalog Confidence: 80% Verified Aug 8, 2026

Difficulty: ★ Est. 5 min

Check the cooling fan

If the fan is noisy or not spinning, it may need replacement.

Source: ProductDB new-categories research catalog Confidence: 80% Verified Aug 8, 2026

Difficulty: ★★ Est. 20 min

Replacement parts for the BenQ TH685

BenQ TH685 Replacement Lamp BenQ TH685 Air Filter BenQ TH685 Remote Control BenQ TH685 Power Supply BenQ TH685 Replacement Lens

← All BenQ TH685 error codes

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