Error message E9

Difficult to say since we don't know the make & model.

Usually, you can search the internet for:

Make + Model + error code E9

and sometimes it will tell you what the error means.

...

Jayshree, E9 error, pressure sensor error/water sensor error.
Replace water level sensor. The error display disappears if power button is turned off and on.This is what the service manual states.
Check the attached links,instruction and guides, Good luck
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what means of e9 error code in onida split ac ?

HI
MY HITACHI WAC MODEL for 1.5 lr, DISPLAY SHOWING E9 ERROR CODE. ALREADY COMPLAIND TO HITACHI CUSTOMER CARE, BUT NOT GETTING POSITIVE RESPONSE. NOW CAN YOU PLESAE LET ME KNOW WHAT DOES THAT (E9) ERROR MEANS AND HOW TO RESOLVE THE SAME?.
THANKS

This is the technicians code telling the tech where to start the repair. It is time to replace this camera since the cost of repair is more than the camera is worth.

This question has been answered repeatedly. Pentax error codes are mostly for camera repair technician diagnosis and most of the time mean the camera is broken and needs professional servicing. Some Pentax Error Codes:
E: "E" often indicates a film jam. This code can appear when the film is inserted incorrectly, when the batteries are changed in the middle of a roll of film, if you are using defective film, etc. If "E" appears in your camera's information display, try to rewind your film manually (see your user's guide for instructions on how to activate your mid-roll rewind function), and try a different roll. If this problem keeps occurring, you might need to send the camera to us for repair.
E3, E7, E37: These codes often signal a problem with your shutter mechanism.
E9, E93-E97: These codes may indicate a problem with your zoom lens.
H0-H9: These H codes can also identify a problem with your camera's shutter.
U1-U9: These U codes may also indicate a problem with your camera's zoom lens.

These codes are standard for both Digital and film cameras.

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Listing of Pentax codes E3, E7, E37: These codes often signal a problem with your shutter mechanism. E9, E93-E97: These codes may indicate a problem with your zoom lens. H0-H9: These H codes can also identify a problem with your camera's shutter. U1-U9: These U codes may also indicate a problem with your camera's zoom lens.

The IQ Zoom cameras are designed to display error codes (E0, E2, E9, E10, E1A, E37, E90, HL, H4, H5, etc.) when something goes wrong internally with one of the mechanisms or electronic components. These diagnostic displays help to determine where the problem is. When you see an error code, ask a qualified PENTAX repair technician to examine the camera. For information on a specific error code, call Pentax customer service department toll-free at 1-800-877-0155, Monday-Friday 7:30am-4:30pm, Mountain Standard Time.