Safe lock help · LA GARD (dormakaba)
Safe lock troubleshooting › LA GARD (dormakaba) › LA GARD 3750 / 3750-K keypad (LGBasic and ComboGard)
The LA GARD 3750 (also called the 3750 LGCombo) and the 3750-K are round electronic keypads that go with LA GARD Basic and ComboGard locks. The battery sits in a compartment under the keypad, on the outside of the door. The 3750-K adds a port for an eKEY II. This guide covers how to open the lock, change the code, replace the 9-volt battery, and what the double and triple signals mean.
Want the whole manual? Jump to the manufacturer download links.
Is this your lock?
- A round keypad on the safe door with a battery compartment cover at the bottom. It comes in satin chrome, brass or black.
- It uses one 9-volt alkaline battery and a six-digit code. With the LGBasic lock, LA GARD’s cut sheet lists a manager code and one user code.
- The 3750-K has a data port for an eKEY II. The plain 3750 does not.
- The lock behind the keypad is usually a dead bolt lock (you turn the keypad). LA GARD’s 3750-K sheet also covers swing bolt locks (you turn the safe handle).
- A LA GARD keypad with light-bulb keys is a 5715 / 5750. One with a dormakaba logo and an Enter key is a 700 Series. See the related guides below.
How to open it
- Enter your six-digit code. (On a 3750-K set up with an eKEY II, insert the key and then remove it.)
- The lock gives a double signal (two LED flashes and two beeps) to say the code is valid.
- Within 4 seconds, turn the keypad clockwise to the open position (dead bolt lock). On a 3750-K with a swing bolt lock, turn the handle to the open position instead.
- Pull the door open.
- An invalid code gives a triple signal (three LED flashes and three beeps).
How to change the battery
Use a 9-volt alkaline battery (we recommend Procell) and replace it at least once a year. Repeated LED flashing and beeping while you open the lock means the battery is low and needs replacing right away. The lock keeps its programming in memory, even with the battery out.
- Take off the black plastic battery compartment cover at the bottom of the keypad by gently pulling down on its handle.
- Let the battery and its leads drop down out of the compartment. If it does not drop, gently pull on the battery until it does.
- Unsnap the connector from the two terminals on the top of the battery. Hold on to the connector, so you do not pull the wires out of the housing.
- Snap a new 9-volt alkaline battery onto the connector.
- Gently push the battery and the leads all the way up into the compartment.
- Put the cover back by placing one side in position first and then pressing the other side into place. Make sure it is seated right, because a cover that is on wrong will stop the keypad from turning all the way.
- The data port on the 3750-K is for the eKEY II only. LA GARD warns that connecting power to it will damage the system.
How to change the code
Always do this with the safe door OPEN.
Test the new code several times before you close the door. Do not use a birthday or other predictable number, and keep the code secret.
3750
- Press 0 six times.
- Enter your existing six-digit code one time.
- Enter your new six-digit code two times.
- A double signal means it worked. A triple signal means the old code is still valid.
- If you make a mistake, wait 30 seconds and start again.
3750-K
- Enter your existing code and hold down the last digit until the lock gives two double signals and the LED stays on. (With an eKEY II set up, enter the code, then insert the key and leave it in until the lock double signals and the LED stays on.)
- Press 0.
- Enter your new code two times. (With an eKEY II set up, insert it again.)
- A double signal means it worked. A triple signal means the old code is still valid.
- If you make a mistake, wait 30 seconds and start again.
- The manager features (a manager code and one user code) are set in LA GARD’s separate manager instructions, which are not on this page.
Beeps and lights
| What you hear / see | What it means |
|---|---|
| Double signal (2 LED flashes, 2 beeps) | The entry was valid and accepted. |
| Triple signal (3 LED flashes, 3 beeps) | The entry was invalid. During a code change it means the old code is still valid. |
| Repeated LED flashing and beeping while opening | The battery is low. Replace it right away. |
| LED flashes red every 10 seconds | The lock is in the 5-minute wrong-try delay. |
Wrong-code lockout
Entering four invalid codes in a row starts a 5-minute delay. The LED flashes red every 10 seconds, and a key press only gives three signals. When the delay ends, two more invalid codes start another 5 minutes.
If it still won’t open
It beeps and flashes over and over when I open it
That is the low battery warning. Replace the 9-volt battery right away.
The keypad does nothing
The battery may be dead, or the lock may be in the 5-minute delay. Change the battery (see the battery section) and wait the delay out before you try again.
It double beeped but the door will not open
You only have 4 seconds after the double signal to turn the keypad (dead bolt lock) or, on a 3750-K with a swing bolt lock, the handle. Be ready to turn right away.
The keypad will not turn all the way after a battery change
The battery compartment cover is probably not seated right. Take it off and put it back, one side first, then press the other side in.
Download the full manufacturer instructions
This page is a quick-reference summary. For every feature and diagram, use the official manual for your model:
- LA GARD 3750-K User Operating Instructions (PDF, P/N 756.118, 12/08)Kaba Mas document, hosted by MBA, a safe lock distributor.
- LA GARD 3750 LGCombo Instructions (PDF, 2003)LA GARD user sheet for the 3750, hosted by MBA.
- LA GARD 3750 LGCombo Cut Sheet (PDF)Finishes, outside battery compartment and features. Hosted by MBA.
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More lock guides
About this guide. This is an independent guide from Steve’s Lock, Safe and Alarm, a safe and lock dealer. Brand and model names belong to their owners and are used only to help you identify your lock. We are not affiliated with the manufacturers. These steps summarize the manufacturers’ own instructions; your lock may be a different version, so if anything here does not match what your lock does, follow your manual or call us. Always change codes with the safe door open, and test the new code several times before you close the door.
Steps last checked against the manufacturer documents on October 20, 2026.