I have a Canon MP620 printer, error code 1401. Help?

Download the printer driver from Canon.

The print head is not installed [1401], or it is not properly installed (Print head temperature sensor error [1403] / Faulty EEPROM data of the print head [1405]).
If you wish to get more details about this; visit the site linked here; after an hour.

This is consistent with any of error codes 1401, 1403 and 1405. It indicates a problem with the print head.
Per Canon the resolution of these errors 'requires the assistance of a Canon authorised service facility. Please use the link at the top of the page to locate your nearest facility.'
From Canon error page for 'Orange light blinking 5 times':

1401/E05
Description: The print head is not installed or has not been properly installed.

1403
Description: A print head temperature sensor error has occurred.

1405
Description: Faulty data of the print head.

http://www.canon.co.uk/support/consumer_products/product_ranges/printers/pixma/error_codes/

Cannon pixma 3500 Flashing orange light count the blinks for the error,

The diagnostic message is rather clear. Return it to the store.

Hi, This error is related to the Print head of your printer. I recommend getting in contact with Canon to activate the warranty (if it's still under warranty) or getting it replaced. They usually are not expensive and may very well be cheaper than a new printer. Do you have their number?
Hope i was of any help. If so, please rate me. Thank you.
Pcsimples

try at Canon U.S.A. : Support & Drivers : Consumer & Home Office

Print head not installed,
or not properly
installed.
[1401] U051 Print head is not installed. Install
the print head.
Install the print head properly.


It may be that print head is defective or main PCB assy

This error is the print head is not installed
[1401], or it is not properly
installed (Print head temperature
sensor error [1403] / Faulty
EEPROM data of the print head
[1405]).