Modules Turn On or Off by Themselves

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Why do some modules sometimes turn on and off by themselves?

Certain devices in your house can cause electrical interference. Devices such as baby monitors, wireless intercom systems, or anything that transmits signals over the house wiring might interfere with X10 codes. Televisions and computers can also transmit noise, even if turned off. This interference can stop X10 signals from getting to the right module(s), causing intermittent control.

In some cases, it is possible for this noise to change a transmitted code into a different one, which might cause the wrong module to turn on or off. This, however, is a rare occurrence. The easiest way to determine whether or not a household device is causing interference is to unplug it entirely. If this fixes the problem, consult an X10 installer, listed on, about plugging the offending appliance into an X10pro Noise Filter XPPF. Please see for more information.

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Key Topics: module, outlet, wiring, phase, electrical, noise, line, interference, circuit

Relates to: LM465, LM15A, LM14A, AM15A, AM486, AM466, WS467, WS4777, WS12A, WS13A