The charger flashes green and red lights alternly with less than 1 second intervals. I have left it in the charger for about 8 hours and it has not charged up.

I agree that the pictographs are not very helpful. You probably have one of the new chargers. I have an old one, which is a little easier to figure out.

From top to bottom

1. The flashing green light with the electric plug indicates that the unit is plugged in and ready to go.
2. The flashing red little fan means that the battery is too warm so it is just cooling it and not charging it at that moment.
3. The solid red empty battery outline means that it is charging but hasn't got very far, less than 80% full.
4. The mostly full battery outline with both solid red and green lights at the same time means it is 80% full or more
5. The full battery outline and solid green with the musical notes means it is full up.
6. The broken battery outline with flashing red and green means you've got a broken battery.
7. The yellow light with the wrench means the charger is "conditioning" the battery, whatever that means.
8. The yellow light with the fan means "cooling abnormality."

Hope this helps

AHX18MEV
4 - 12
[8] SELF-DIAGNOSIS FUNCTION
1. Indoor unit
(AH-X18MEV, AH-X18MEV-1, AH-X24MEV, AH-X24MEV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The operation lamp (red), timer lamp (orange) and Super jet lamp lighter) flash to indicate the information of malfunction.
(Display of self-diagnosis result)
The operation lamp (red) and the Super jet lamp (green) flash in synchronization with the timer lamp (orange).
(AH-XP18MV, AH-XP18MV-1, AH-XP24MV, AH-XP24MV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The POWER CONSUMPTION indicator indicates the information of malfunction by showing the main category error (number) and the sub-category
error (-number) alternately in 1-second intervals.
Example: Compressor high-temperature error
Remark

AHX18MEV
4 - 12
[8] SELF-DIAGNOSIS FUNCTION
1. Indoor unit
(AH-X18MEV, AH-X18MEV-1, AH-X24MEV, AH-X24MEV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The operation lamp (red), timer lamp (orange) and Super jet lamp lighter) flash to indicate the information of malfunction.
(Display of self-diagnosis result)
The operation lamp (red) and the Super jet lamp (green) flash in synchronization with the timer lamp (orange).
(AH-XP18MV, AH-XP18MV-1, AH-XP24MV, AH-XP24MV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The POWER CONSUMPTION indicator indicates the information of malfunction by showing the main category error (number) and the sub-category
error (-number) alternately in 1-second intervals.
Example: Compressor high-temperature error
Remark

3. CHART
<INDOOR UNIT> ?:1-second ON / 1-second OFF
Problem
symptom
Outdoor
unit indication
(LED1)
Indoor unit Malfunction
No.
Content of diagnosis Check point Action
Lamp Main Sub Main Sub
Normal
condition
Normal
blinking
? ? ? ? ? Timer (Orange) 0 0 Normal
Operation (Red)
Super Jet (Green)
Indoor and
outdoor
units do not
operate.
1-time ? ? ? ? ? Timer (Orange) 1 0 Outdoor unit
thermistor
short-circuit
Heat exchanger
thermistor short
circuit error
(1) Measure the resistance
of the outdoor
unit
thermistors.
(1) Replace the outdoor
unit thermistor
assembly.
? Operation (Red)
Super Jet (Green)
? ? ? ? ? Timer (Orange) 1 Outdoor temperature
thermistor
short circuit error
(2) Check the lead wire
of the outdoor unit
thermistor for torn
sheath and shortcircuit.
(2) Replace the outdoor
unit thermistor
assembly.
? Operation (Red)
? Super Jet (Green)
? ? ? ? ? Timer (Orange) 2 Suction thermistor
short circuit
error
(3) No abnormality
found in above
inspections (1) and
(2).
(3) Replace the outdoor
unit control
PWB assembly.
? Operation (Red)
? Super Jet (Green)
? ? ? ? ? Timer (Orange) 3 2-way valve
thermistor short
circuit error
? Operation (Red)
? ? Super Jet (Green)
LED1
AU-X24MV, AU-X24MEV
AU-X18MV, AU-X18MEV
LED1

No solution-I have the same exact proplem-faulty product-plan to send it back

Hi,
While working it stops and flashes red approximately 2 seconds interval

Causes
Protection circuit is activated depending on the temperature of the surroundings

Remedy
Switch off the power supply and power on after the temperature have reduced.


While working it stops and flashes red approximately 0.5 seconds interval

Causes
1.Using speakers having less impedance than the specified.
2.If speaker core wire touch each other Protection circuit is activated


Even applying power red flashes 0.5 seconds interval

Cause
Amplifier circuit has failed

Remedy
Switch off the power and contact denon service centre


Thank You

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

Make sure all the air filter caps are all the way in and nothing is broken from it. that was my cause..i had the same problem

Only Solution is Re-burn printer firmware.

Mahesh DG, Pune

Have you activated phone yet? When phone is activated and in service it flashes green. It's hard to believe it would flash green without a SIM card, as there is no service...unless AT&T is providing emergency service only and you're getting a flashing green which means you're in range of their towers.