The --H display is the documented no-timer position, not an error code or missing-hour sensor. Tap Timer until the wanted hour appears and flashes three times, or leave --H selected to run without automatic shutoff. Unplug before filter or sensor care. Keep liquids, sprays and oils away from the motor and electronics, and never open the powered housing. Check the light pattern, timing and selected mode before changing settings. One controlled test is more useful than repeated resets or an unverified replacement part.
Models covered
Safety first
- Unplug before filter or sensor care. Keep liquids, sprays and oils away from the motor and electronics, and never open the powered housing.
What the symptom may indicate
Checks in the right order
- Confirm the exact state
timer shows --H. The --H display is the documented no-timer position, not an error code or missing-hour sensor.
- Apply the official check
Tap Timer until the wanted hour appears and flashes three times, or leave --H selected to run without automatic shutoff.
- Read the result
If the expected state returns, no part decision is needed. If the same symptom persists after one careful check, keep the model, light pattern and timing and contact the manufacturer rather than repeating resets.
Stop and get qualified help when
- Stop and contact support for a damaged cord, smoke, electrical smell, abnormal heat, liquid inside the housing or a fan that will not run after the documented check.
Next step
Repair, replace a part, or arrange a diagnosis?
Use the checks and stop conditions above to choose a cautious next step. A symptom alone never proves that the appliance has failed.
Resolve it without buying anything
Complete the 3 user-accessible checks in order. If normal operation returns and no warning sign remains, no replacement is indicated.
Replace only the confirmed part
If the checks isolate a worn or blocked component, match its complete reference to the exact appliance model before ordering.
This guide does not identify a replacement part. Do not order a generic component from the symptom alone.
Arrange a diagnosis before replacing the appliance
Stop at any warning sign listed above. A qualified diagnosis should confirm that repair is unsafe, unavailable or uneconomical before an appliance replacement is considered.
Sources used
- Levoit — Levoit's official documentation describes “timer shows --H” and the bounded user action retained on this page.
Last checked: 30 August 2026