Anthem M1 - Manual (Page 16)

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Power LED:
This is on when the amplifier is operating normally and off at all other times.
Status LED:
Normal brightness indicates operate mode.
If the M1 detects a problem, the amplifier output will turn off for 12 seconds* and the LED will flash a number of times, pause for 2 seconds, and
repeat the flash cycle to allow the user to count the number of flashes per cycle before the power button is pressed twice. The AC supply voltage
code does not continue to flash once normal voltage returns. Output will be interrupted for only 3 seconds if music is playing while the LED is
flashing and the switch is pressed quickly two times.
In the event that operation resumes and a second type of fault occurs, the code for the last fault is displayed.
*In an over-temperature condition the temperature must drop by 4 degrees Celsius before output resumes. This could take a few minutes
depending on ambient temperature.
2 flashes: AC supply voltage out of range. If the amplifier is powered from a 240V line, it is likely due to line voltage exceeding 264V.
If the amplifier is powered from a 120V line, it is likely due to low line voltage. This can happen as a combination of very loud musical passages
and marginal line voltage, or the outlet may be far from the distribution panel resulting in excessive line losses. Disconnect other equipment from
the circuit or use a different one. Do not use long extension cords. If none of the above helps, the line voltage in your area may be too low and a
240V outlet may be needed (contact a licensed electrician).
3 or 5 flashes: Output current exceeds limit. This can happen if output is very high into a load impedance of less than 2 ohms, or if the speaker
wires are forming a short-circuit. Verify that the speaker wires are not frayed or touching anything except the amplifier output terminal and speaker
input terminal.
3. LED INDICATION CODES