How To Reset Garmin Watch Forerunner 45 | Fix Bugs Fast

A reset can clear glitches, restore normal button response, and get your watch pairing and syncing again after a freeze or weird setting change.

Your Forerunner 45 can act up in a few familiar ways: a stuck screen, a loop on startup, workouts that won’t save, odd vibration behavior, or Bluetooth that won’t stay connected. When that happens, “reset” can mean two different things.

One option is a restart (a soft reset). It’s the first move when the watch freezes. The other is a full reset through the menu, which can erase activity history and user-entered data depending on the option you pick. This article walks you through both, plus what to back up, what you’ll lose, and how to set everything back up without headaches.

What reset means on a Forerunner 45

Garmin uses reset wording in a couple places, and that can trip people up. On the Forerunner 45, think in three levels:

• Restart (soft reset): Forces the watch to power off and back on. This targets freezes and unresponsive buttons.
• Reset settings: Puts device settings back to default values while keeping activity history on the watch.
• Delete all / full wipe: Clears activities and user-entered information from the watch.

If your watch is frozen, start with the restart. If your watch works but settings feel “off” (units, tones, alerts, odd screens), reset settings can help. If you’re selling the watch, pairing to a new phone, or a stubborn sync issue won’t quit, the delete-all option is the clean slate.

Before you reset, save what you can

Most people reset because something already feels broken, so the goal is to avoid losing workouts you still care about. Your best safety net is Garmin Connect syncing.

Quick backup checks

• Open Garmin Connect on your phone and let it sync fully.
• If the watch still connects, start a manual sync from the app’s device page.
• Confirm recent activities show in Garmin Connect (not only on the watch).

If the watch is stuck and can’t connect, you may lose any activities stored only on the device. Once you reset or wipe, there’s no reliable way to pull that local history back.

What you may need after a reset

Plan to spend a few minutes rebuilding your setup. You may need to redo items like:

• Time format and time zone choices
• Units (miles vs kilometers)
• Activity data screens
• Alerts (pace, heart rate, lap)
• Do Not Disturb and sleep hours settings
• Phone pairing and notification settings

Restart first when the watch is frozen

If your Forerunner 45 won’t respond, a forced restart is the least destructive reset style. It’s also the step that solves many “it won’t do anything” moments.

Button method for a restart

1. Press and hold the LIGHT button for about 15 seconds.
2. Release when the watch powers off.
3. Press LIGHT again for about one second to turn it back on.

If you want Garmin’s official wording for this action, Garmin describes the same restart method here: Garmin manual page on restarting the device.

When a restart is enough

A restart usually fixes issues like a stuck timer screen, buttons that stop registering presses, a widget loop that won’t scroll, or a single crash after a firmware update. Once the watch boots, give it a minute, then test the exact thing that failed: start an activity, open the menu, or try a sync.

When a restart won’t cut it

If the watch keeps freezing after restarts, if settings refuse to “stick,” or if Bluetooth pairing keeps breaking in the same way, you’re in reset-menu territory.

How To Reset Garmin Watch Forerunner 45 using the system menu

This is the menu path you’ll use when the watch still operates well enough to reach settings. It gives you options, so you can choose a lighter reset before a total wipe.

Menu path to the reset options

1. From the watch face, press and hold UP.
2. Open the menu, then go to System.
3. Select Reset.
4. Pick the reset option that matches your goal.

Garmin lists these reset options in the Forerunner 45 manual here: Garmin manual page on resetting default settings.

Take your time on the final selection screen. A settings reset and a full wipe are not the same thing, and the labels can feel close when you’re stressed and trying to fix a watch that’s acting strange.

Pick the right reset option for the problem

Use this as a decision map. It helps you choose the least destructive option that still solves the issue.

Reset settings

This option returns device settings to default values while keeping activity information on the watch. If your watch suddenly shows a weird unit system, alerts behave oddly, or screens seem rearranged, this is often the clean fix. You’ll still need to rebuild preferences afterward.

Delete all

This clears activities from the watch history. Pick this when you want a clean slate, when you’re moving the watch to a different person, or when the watch and phone pairing gets stuck in a loop and nothing else solves it.

What gets removed vs what stays

Garmin Connect data tied to your account can still remain in the app and on Garmin’s servers if it already synced. The watch itself is what gets cleared. That’s why syncing first is worth doing, when the watch still connects.

Reset planner table for common scenarios

Use this table to match your symptom to the reset level that usually makes sense.

Problem you see	Try this reset level	What you may lose
Screen frozen, buttons ignore presses	Restart (hold LIGHT)	None in most cases
Watch restarts on its own once	Restart, then observe	None in most cases
Units changed, alerts feel wrong	Reset settings	Device preferences
Pairing keeps failing after normal troubleshooting	Delete all, then re-pair	Watch history not yet synced
Sync stalls at the same point	Reset settings, then test	Device preferences
Selling or gifting the watch	Delete all	All watch data and user entries
After update, menus act strange	Restart, then reset settings	Device preferences
Activity history on watch is cluttered	Delete all	Activities on watch

Steps after a reset so the watch feels normal again

A reset fixes the glitch, then you rebuild the “feel.” This part is where many people get annoyed, since the watch works again but doesn’t feel like their watch yet. A short setup routine gets you back to normal fast.

Re-pair with your phone when needed

If you used a delete-all reset, you’ll usually need to pair again. Open Garmin Connect, add a device, and follow the on-screen pairing steps. Keep your phone close to the watch during the first sync.

Restore settings that affect daily use

These few settings shape your day-to-day experience more than most people expect:

• Time settings: 12-hour vs 24-hour display
• Units: distance, pace, weight
• Sounds and vibration: button tones and alerts
• Do Not Disturb: sleep hours and notification silence

Rebuild activity screens with intention

If you run or walk often, your data pages can feel “wrong” after a reset. Pick 2–4 fields you actually glance at mid-activity. Too many screens turns a run into button-mashing.

A simple setup that works for many runners:

• Page 1: elapsed time + distance
• Page 2: current pace
• Page 3: heart rate

What to do when the watch still misbehaves after resetting

If you reset and the same issue returns, treat it like a repeatable bug. You’re trying to learn what triggers it, not guess in the dark.

Run a tight test

1. Restart the watch once more.
2. Sync with Garmin Connect and confirm the sync completes.
3. Start a short activity, save it, then sync again.
4. Change one setting, then test the behavior you care about.

If the issue happens only after changing a certain setting, you just found your trigger. If it happens with zero changes, the watch may be in a deeper firmware or hardware problem state.

Battery and charging oddness after a reset

Right after a reset, battery estimates can look strange for a day. Wear the watch normally, record a short activity, and charge it once. The watch tends to settle into a more predictable pattern after a normal use cycle.

Data-loss table for reset choices

This table helps you see what gets wiped at each level, so you can pick the lightest reset that still solves the problem.

Reset action	What stays	What gets removed
Restart (soft reset)	All settings and history	Temporary state causing the freeze
Reset settings	Activities stored on the watch	Device preferences and custom settings
Delete all	Data already synced to Garmin Connect	Watch history and user-entered information

Quick reset checklist you can follow every time

When you’re annoyed and just want the watch working again, a short script keeps you from tapping the wrong reset option.

1. Sync in Garmin Connect if the watch still connects.
2. Try a restart (hold LIGHT about 15 seconds).
3. If the watch works again, test the exact feature that failed.
4. If problems repeat, open System > Reset.
5. Pick reset settings first when you only need to clear odd behavior.
6. Pick delete all when you need a clean slate or you’re moving the watch to a new owner.
7. After resetting, re-check units, alerts, and activity screens.

Once you’ve done it once, resetting the Forerunner 45 is a calm, two-minute job. The trick is choosing the right level, syncing before you wipe, and rebuilding only the settings you actually use.