How to Reset an Aprilaire Thermostat (By Model)

Which reset do you actually need? A full factory reset wipes your schedule and Wi-Fi setup. A service-reminder reset only clears a filter or water-panel alert. Aprilaire sells both thermostats and humidifier controls under overlapping model numbers, so the first step is confirming which device and which reset you have. Not every fix below applies to every model.

Find your exact model number first

Check the model number printed on the thermostat’s faceplate or in its Settings/About menu before doing anything else. “Aprilaire thermostat” isn’t one product; it’s several different lines with different hardware and different reset buttons:

• 8000 series (8570, 8620, 8620W): mid-range programmable thermostats with a recessed reset button under the front cover.
• 8400 series (8444, 8446, 8448, 8463, 8465, 8466, 8476, 8476W): non-programmable and Wi-Fi models with a reset button under the battery door.
• Older mechanical/digital models (8344, 8365, 8348): no dedicated reset button; you clear the filter reminder through a button sequence instead.
• App-connected smart models (8910W and similar): touchscreen menu with a separate “Reset Service Reminders” option and a full factory reset option.

One important correction: if you searched for “Aprilaire 600 series thermostat reset,” that model doesn’t exist as a thermostat. The Aprilaire 600 is a whole-house bypass humidifier, and Model 60/62 is a humidistat (the digital control that runs a humidifier), not a thermostat at all. If your device is labeled Model 60, 62, or 600, skip to the humidistat section below. The reset procedure is completely different.

Aprilaire 8000 series (8570, 8620, 8620W): factory reset

Safety first: you don’t need to cut power to the thermostat for this reset, but if you’re also pulling the unit off the wall plate to inspect wiring, shut off power at the breaker or furnace switch first and confirm the display is dead before disconnecting anything.

1. Locate the recessed reset button under the front cover of the thermostat (not on the back).
2. Using a paperclip or similarly thin tool, press and hold the reset button for 5 seconds.
3. The thermostat will reboot and restore factory default settings. Your schedule, setpoints, and Wi-Fi credentials (on 8620W) will be cleared and need to be reconfigured.

Aprilaire 8400 series (8444, 8446, 8448, 8463, 8465, 8466, 8476, 8476W): factory reset

1. Open the battery door on the front of the unit.
2. Press and hold the reset button located underneath it.
3. Release once the display reboots. Like the 8000 series, this restores factory defaults and clears any saved Wi-Fi network on the 8476W.

Older mechanical/digital models (8344, 8365, 8348): there’s no factory-reset button

These models don’t have a dedicated reset button. What most people actually want here is to clear the filter-change reminder, not wipe the whole thermostat:

1. Set the MODE switch to OFF.
2. Press and hold both temperature ADJUST buttons at the same time until “ROOM” and “OFF” disappear from the display.
3. Press the LIGHT button repeatedly until “CHANGE FILTER” appears.
4. Use the L and M buttons to set the reminder interval (1, 3, 6, 12 months, or OFF).
5. Press LIGHT again until “DONE” displays.

If one of these older units is unresponsive rather than just showing a stale filter reminder, the fix is a power cycle, not a reset sequence: shut off power at the breaker for 30 seconds, then restore it.

App-connected smart models (8910W and similar): two different resets

These touchscreen models draw a real distinction the older units don’t:

• Reset Service Reminders (in the Settings menu) clears the Change Air Filter, HVAC service, dehumidifier service, and Change Water Panel reminders and restarts their timers. It does not touch your schedule or Wi-Fi.
• Factory reset wipes everything, including your saved network. Only use this if the thermostat is genuinely malfunctioning, not just to clear a filter alert.

For Wi-Fi-specific connection problems on any Wi-Fi model, follow the Wi-Fi Quick Start Guide that shipped in the box rather than a full factory reset. Reconnecting to your network doesn’t require erasing your schedule.

Aprilaire Model 60/62 humidistat: this isn’t a thermostat reset

If your device is labeled Model 60 or 62, it’s the digital control for a whole-house humidifier, wired separately from your thermostat. To reset it:

1. Turn the control knob to the Test/Reset position.
2. Hold for about 5 seconds until the green Humidifier On light blinks.
3. This also resets the water-panel change timer after you’ve replaced the pad. Turn the knob to Test/Reset again once the new pad is in.

There is no factory-reset button on this unit and no menu to navigate; it’s a single knob.

If the thermostat still won’t reset

Most common cause: dead or badly connected batteries. Check those before assuming a hardware fault.

• Check the power source. A thermostat running on batteries with no backup power will act erratic if they’re low; a hardwired unit with no C-wire can brown out mid-reset. Swap batteries first.
• Confirm the reset button is actually being pressed. On the 8000 and 8400 series, the button is small and recessed specifically to prevent accidental resets. A fingernail usually won’t reach it; use a paperclip.
• Check wiring only if you’re comfortable removing the thermostat. Turn off power at the breaker first, confirm the display is dead, then check that R, C, W, Y, and G terminals are seated firmly. Loose wiring under the terminal screws is a common cause of a thermostat that won’t power up at all.
• Past this point, call a licensed HVAC tech if the unit still won’t power on or reset after confirmed good batteries/wiring. That points to an internal fault, not something to keep forcing with repeated reset attempts.

FAQ

Does resetting an Aprilaire thermostat delete my schedule? A full factory reset does. A “Reset Service Reminders” function (on app-connected models) does not; it only clears filter/HVAC/water-panel alerts.

Where exactly is the reset button on an Aprilaire 8620? Under the front cover, not on the back of the unit. It’s recessed; use a paperclip and hold for 5 seconds.

My device is labeled “Aprilaire 60.” How do I reset the thermostat? It isn’t a thermostat. Model 60/62 is a humidistat that controls a whole-house humidifier. Turn its knob to Test/Reset and hold about 5 seconds instead of looking for a thermostat reset button.

Will a factory reset fix Wi-Fi connectivity problems? Usually not by itself. Follow the Wi-Fi Quick Start Guide included with the thermostat to re-pair it first; reserve a factory reset for when the unit is otherwise malfunctioning.

Last reviewed: August 2026. Confirm model-specific steps against your unit’s manual at aprilaire.com, since button placement varies across the 8000 and 8400 series.