How do I clear a CO error on m y gas alert Max XT 2 detector

Check the wiring coming from the house going to the smoke alarm.

Junai, Try to vacuum/blow dust out of detector, if this does not work detector faulty and will need replaced. Most detectors have a label stating replacement date or expiry. Check the attached links,instruction and guides, Good luck
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http://www.kidde.com/home-safety/en/us/co-safety/about-carbon-monoxide-alarms
Looking for Answers about Garrison Garrison Plug in Carbon Monoxide Alarm
Why is my Carbon Monoxide Detector Beeping with pictures

Troubleshooting a GE Simon XT: Clear Errors and Alerts ...

? 3:06
https://www.youtube.com/watch?v=AtOCuthlsTo
Oct 3, 2011 - Uploaded by LiveWatch Security
Troubleshooting a GE Simon XT: Clear Errors and Alerts -Wireless Home Security ... Many times the Simon XT panel willbeep to indicate there is something ... How do you turn off the warning beep when you turn on alarm? I find it very useless and annoying. Can't seem to find a way to turn that feature off.

My Simon XT is beeping every 4 hours. How can I stop it ...

help.livewatch.com/.../20399861-My-Simon-XT-is-beeping-every-4-ho...

Aug 28, 2011 - If your panel has been beeping throughout the day and you want to turn off ... Scroll down on the Simon XT until you see "System Programming".Missing: control ‎hello ‎control ‎box

I'm afraid Mr Gallant is right on this one
I have tried this on your behalf and they very helpful with limited information available to me.
Try emailing [email protected] I reproduce below the messages I received from him
"Can you provide the following information please?
1. Serial number of your leak detector
2. Current running hours of the leak detector
3. Any error codes recorded"
and
""The serial number for the leak detector is located on the left hand side of the chassis. It will be a 6 digit number of an older version or may begin with -HLD.
You can view the current running hours by going into the following menu - maintenance/detector hours.
If there is a fault with the unit, you should have an alert in the panel advising to press next for error. Here you can display what error is present.
Let me know how you get on."

9.November.2015
"

Is Safe-T-Alert Surface Mount 12V RV CO Alarm a carbon monoxide detector?

This is not a beeping smoke detector. It is probably a CO detector that was installed by your alarm company. GE model 240-COE will give a double beep every 5.5 minutes when the device reaches end of life. Call your alarm company to have it replaced.

What are some of the better-known companies that make gas detectors?

There have continual problems with this unit. It may be that you have it mounted or plugged-in in the wrong place. As a co detector it should not be mounted in the same room as the gas appliance or wood burning stove. In addition, as a co/gas detector it should NEVER be mounted on the ceiling. A co/gas detector should always be mounted or plugged-in to a wall receptacle that is at least, but not more than 2 feet off the floor and not in the same room as the gas appliance. It will false alarm and give error messages when in fact nothing is wrong. If the problem continues, return it to the place of purchase for a new one.

Battery low,must change,Must check for battery power every 3 months.

possibly low systm battery.......