The button matters because the TP04 family was supplied with more than one filter layout. Reset only after the relevant filter has been replaced. A display error code is a different problem and should not be treated as a filter-life reminder.
Identify the filter before pressing a button
Start by looking at the filter arrangement you replaced, not at a generic Dyson reset video. The Dyson TP04, DP04, and TP06 user guide shows two relevant arrangements: a replaceable combination filter in one version, and separate carbon plus glass HEPA filters in another. The reset controls follow that distinction.
| Filter arrangement in the machine | Reset control | What the reset applies to |
|---|---|---|
| Replaceable combination filter | Hold Night mode for five seconds | The combination-filter life display |
| Separate glass HEPA and carbon filters | Hold Night mode for five seconds | The glass HEPA filter display |
| Separate glass HEPA and carbon filters | Hold Oscillation for five seconds | The carbon filter display |
| Unsure which filter was replaced | Pause and identify the fitted filter first | Avoid clearing the wrong reminder |
Dyson’s TP04 combination-filter instructions describe the Night mode reset for that arrangement. Dyson’s separate filter-life support guidance is useful when your machine has individual filter-life entries.
A TP04 with separate filters does not need both counters reset because one filter was changed. Reset the counter for the component that was actually replaced. If both filters were replaced, complete the appropriate sequence for each one.
Run the five-second reset sequence
Keep the purifier powered and use the remote that belongs to the machine. The display should be visible so you can confirm the countdown and the updated filter-life reading.
- Identify whether you replaced a combination filter, the glass HEPA filter, or the carbon filter.
- For a combination or glass HEPA filter, press and hold the remote’s Night mode button for five seconds.
- For a separate carbon filter, press and hold the remote’s Oscillation button for five seconds.
- Release the button only after the countdown finishes, then review the filter-life display.
The five-second hold is not a general restart. It tells the machine that the selected filter counter has begun a new cycle. Pressing a button briefly changes normal operating settings, so a quick tap does not complete the reset.
Do not treat an error code as a filter reminder
The filter-life display and an error code call for different responses. The TP04 user guide says the display reports remaining filter life and indicates when replacement is due. It also directs owners to turn the machine off and back on for an error code, then contact Dyson support if the code remains.
A filter reset belongs after a filter replacement. It does not clear a fault, repair a loose connection, or change an air-quality measurement. Avoid broad advice that tells you to hunt for a reset button on the purifier itself. The relevant filter controls are on the remote, and the correct one depends on the filter arrangement.
If the indicator stays on after the countdown
Work through the physical installation before repeating the reset. The manual shows the filters sitting behind the machine’s shrouds, with the parts pushed into position until they click. A filter that is not seated as intended deserves attention before the counter is reset again.
Use this short diagnostic sequence:
- Confirm that the machine has the filter layout you selected in the table above.
- Recheck that the replacement filter and shroud are fully seated according to the user guide.
- Repeat the five-second hold with the matching remote button, watching for the countdown rather than guessing from a brief screen change.
- If the display shows an error code instead of a filter-life reminder, use the error-code instruction in the user guide rather than repeatedly resetting a filter counter.
- If the display still does not reflect the completed replacement, use Dyson’s support path for the machine rather than forcing a reset sequence that does not match the message on screen.
The same manual also notes that the TP04 can be controlled through the Dyson Link app when the remote is unavailable. That is useful for ordinary machine control, but the exact filter-life path in the app depends on the region and app version. The remote sequence remains the clearest documented route for the specific filter counter.
Keep filter life separate from air-quality readings
The TP04 presents several kinds of information. Its information menu includes readings for air quality, temperature, humidity, and filter levels. The filter-life line is a maintenance reminder for the installed filter, not an assessment of the air in the room at that moment.
That distinction prevents two common wrong turns. Resetting a counter does not change the current particle, gas, or humidity display. Replacing a filter does not make an unrelated error code disappear. Read the label and symbol on the display first, then choose the matching action.
For the model’s broader features and ownership context after the maintenance question is settled, see our Dyson TP04 review .
A short maintenance checklist
Before closing the shrouds and moving on, use the following checklist:
- Keep the replacement filter packaging off the machine and confirm the filter is fully in place.
- Reset the counter only after the filter replacement is complete.
- Use Night mode for a combination or glass HEPA filter.
- Use Oscillation for a separate carbon filter.
- Wait for the full five-second countdown.
- Read the display again to confirm that it is a filter-life message, not an error code.
The TP04 user guide also says not to operate the purifier without filters in place and to unplug it before cleaning or changing filters. Those directions are simple, but they keep filter replacement and electronic troubleshooting from becoming the same task.
Common questions about the TP04 reset
Do both TP04 filter counters need to be reset?
Only reset the counters for filters that were replaced. A TP04 with separate glass HEPA and carbon filters has separate reset actions. A combination-filter version uses the Night mode reset for its replaceable combination filter.
What if the TP04 still shows a purple line after a new filter?
First confirm that the displayed item is the filter-life reminder and that the filter is fully seated. Then use the button that matches the replaced filter and hold it through the five-second countdown. A persistent error code requires the troubleshooting path in the user guide, not another filter reset.
Can the TP04 be reset without the remote?
The user guide says the Dyson Link app can control the machine when the remote is unavailable. App menus and regional support paths differ, so use the support guidance for your exact machine if the remote sequence is not available.