ADT error code FC [How to fix it]

Are you looking for a solution to the ADT error code FC?

In this article, I explain what causes this error and how you can fix it.

What is the ADT error code FC?

"FC" stands for "Failed to communicate" which means your ADT system has an issue communicating with the monitoring center. 

The "FC" message error is displayed on the Honeywell Vista or Lynx panels.

The picture below shows an example of the problem.

ADT Error Code FC Fail to Communicate

Let's see what causes the problem...

What causes the error code FC?

The "Fail to communicate" issue is caused by some of the reasons.

  • Phone wiring not working;
  • Panel with incorrect phone wiring;
  • Interference or noise in the phone line;
  • Dial out miss information;
  • Service disconnected;
  • Damaged equipment.

As you can see, there are different reasons for your ADT alarm system to show the error. You can check every one of them to find out what the problem is.

How to fix the ADT FC error

You need to investigate what could be the cause of the problem.

Sometimes is something simple such as a disconnected or broken wire.

Follow the steps to find out and fix the error.

  • Check if the phone wiring is correctly connected to the panel;
  • Make sure the line is working;
  • Look for possible sources of interference;
  • Double-check the configuration and dial number.

Believe it or not, there were cases where the service was no longer working just because the bill was not paid on time, so you need to check that as well.

The worst-case scenario is damaged equipment that needs to be replaced.

Contact your ADT dealer if that's the case.

Reset the panel to clear the message

After fixing the problem, the next step is to clear the FC error message.

You just need to disarm the alarm and the error message goes away.

Here are the steps.

  • Enter your System Master Code in the keypad;
  • Press  1  (off);
  • Repeat the process.
Honeywell Vista Keypad Disarmed

It's done.

Now you may have your ADT alarm system back to normal.

Just arm the alarm again and you are good to go 😉

Related Articles

Here are some related articles that may help you.


You don't need to contact your ADT dealer every time you face a problem.

Minor errors are easy to fix and you can do it yourself to save time and money.

As you can see, find out and fix the FC error is not rocket science and only requires a little bit of effort and common sense on your part.

If you can't fix the error by yourself, don't hesitate to contact a professional.

You can also visit the ADT website and look for extra information.

Please share this information with your friends.

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