I have a Yale Easy Fit Standard Alarm (EF-BX) Sometimes when I enter my house and enter my code in the keypad, the siren doesn't bleep twice to turn it off, I re-enter the code and sometimes this works and sometimes it doesn't, so the siren goes off. Could my key pad be faulty? Iv'e had the alarm for 2 months. Any ideas.

1. Unlock the car manually. If the alarm remote is not working, use the key directly. Often times opening up the door will stop the alarm. If the driver's side door won't unlock, try the passenger door.

2
Turn on your car. Put the key in the ignition, and turn the car on. If this doesn't turn off the alarm, try turning on and off the dashboard lights a few times without revving up the engine.
3
Utilize common tricks. Factory car alarms have some simple reset protocols to help turn off an alarm. Most of the tricks rely on using the key in the door; simply put, a lot of factory car alarms have a door sensor, so working with the door might be the go-to for a quick fix.
Put the key in the driver's door and turn it twice to the right, then twice to the left. Then insert your key into the ignition and start the car.
Turn the key into the unlock position and hold it for two seconds before opening the door.

4
Disconnect the battery. If the alarm is still sounding after the initial troubleshooting, you'll want to silence the siren as quickly as possible. Car alarms rely on the electronic component of the vehicle, and disconnecting the battery should both silence the siren and reset your alarm. Open up the hood, locate the battery, and with a wrench, remove the negative terminal. Then reconnect it after a minute has passed.
If it is more easily accessible you can also unplug the wiring harness that connects to the car's horn or siren. If the horn or siren gets unplugged it can no longer make noise.

5
Reset the alarm unit. Locate the alarm and transmitter system; refer to your owner's manual for the exact location. Hit the reset switch or turn it off and on.

6
Remove the alarm fuse. This should both silence and take the alarm out of commission until the fuse is replaced. Find the alarm fuse in the fuse box. Remove it, and put the fuse in a plastic bag. You can store it in your glove compartment for safe keeping.
If you cannot locate the alarm fuse right away, remove fuses to see if the alarm will stop. Doing this will not cause damage to the car, but make sure you return the fuses after you've determined they are not for the alarm.
Some car alarms, when tampered with, prevent a car from starting as an anti-theft function. If you remove the fuse and cannot start the vehicle, you will have to take the car to a mechanic or dealer.

7
Press the "panic" or buttons on your keychain remote to stop the alarm. Because the "panic" button can sound the car alarm, it can also stop it. Pressing "unlock" or the "trunk" button can stop the car alarm because it disarms the car's security system.

8
Seek a mechanic if problems persist. If none these reset methods work, try speaking with a mechanic or dealer. If they can recognize the issues over the phone, the fix might be simple. However, further diagnosis might be needed in person.

https://www.wikihow.com/Disconnect-a-Car-Battery

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Because your system is designed to operate off of batteries only, coming up with an external power supply to work around the original design becomes an issue. In order to do what you want to do you would have to have a rechargeable battery maintained by an appropriate charger that would run the system from the charger/supply, charge the backup battery and switchover to the battery in the event of a power failure. These do exist and one manufacturer is Altronix but there are several, you just have to visit a DIY alarm website and get recommendations bearing in mind the battery voltage your system is designed for and the amp hour rating necessary to keep the system running the duration of the power outage and beyond. Keep in mind the reason for your alarm system is security and compromising that with homemade non-UL retrofits might not be the way to go, your choice.

put key in ignition turn it on off for 4 times and u hear a chime and press any button

after locking the car via key fob, few minute later siren and flashers comes on..is it the faulty siren ?

the siren relay in the brain is stuck closed, often times there are multiple siren/ warning device connections in the brain, try a different siren look for wires touching

Have you tried turning the alarm back on so that it goes off again, lock and unlock the car with your fob now, then enter the code. This is because it might still be in the standard immobiliser mode.

This sometimes can also be related to the internal batteries in the alarm ECU or alarm siren module going bad. If your handy the internal batteries can be replaced without buying a new replacement unit. Otherwise, the entire module must be replaced ($$$). Lastly, you can have a Saab indy or dealer disarm the theft alarm on the vehicle. You retain your keyless operation, but the alarm is not active. This is done in the programming and adjustment menus in the TWICE unit with the Saab Tech 2 computer.
Justin Duthie
Strictly Saab
Melbourne, FL

If ews2 alarm is fitted it need to be reset by computer. Any tampering will set it into protectction mode. Had similar problem. You can try the following but if it does not work get someonr with diagnostic computer. PREPARATION 1. Close all doors, trunk, hood and sunroof. 2. The security system must be in 'disarm' mode. The key must be removed from the ignition key slot. ENTER CODE LEARNING MODE 3. Open trunk and leave it opened. 4. Open the drivers door and sit in the drivers seat. 5. Close the drivers door. 6. Cycle the ignition switch 5 times between the 'OFF' position and position 2,(ignition 'ON', all dash warning lamps will illuminate). The red status LED will illuminate continuously, and the siren will 'chirp' once, to indicate that the code-learning mode has been initiated. ?Do No start the engine.? The Ignition switch cycling in step #6 must be performed within 10 seconds. The sequence in steps #1-#6 must be performed within 45 seconds. REGISTER/DELETE ID CODE(S) 7. Open drivers door, (remain seated in the drivers seat) 8. Close the drivers door. 9. Press and release any button on the remote you wish to register in the system. The status LED will shut off momentarily to indicate that one code has been registered. 10. Repeat steps 7 thru 9 to register the three ID codes. It is possible for the system to memorize a total of 4 different ID codes. As a new code is initialized into the memory, the oldest code is automatically deleted. If you had lost your remotes and wished to delete the lost remote ID codes from the memory, you could initialize the ID codes from a newly purchased replacement transmitter four times thereby deleting the previous ID codes from the system memory. EXITING CODE - LEARNING MODE: 11. Open drivers door, and exit from the vehicle, leaving the door opened. 12. Close trunk. 13. Close drivers door. The LED will turn off and the siren will 'chirp twice. 14. The initialization procedure is now completed; Test all remotes to confirm operation.

Have the codes read out for the vehicle. It is likely that the siren for the alarm is causing the false alarm. If the siren is bad, there will be a code set in the central electrical module. (CEM)