Epson printers are known to clog due to how think the OEM ink is. Dye ink printers aren't as bad, but the pigment models are horrible in regards to this. Unless you run a page through the printer 1-2 times a week (more in humid climates), it's only a matter of time with Epson printers. The Stylus Photo 1400 uses Claria ink, which is dye based.
While Epson printers seem to be more prone to clogging then other brands, they are relatively easy to unclog when it happens. The built in utility usually makes the problem worse, so it's better to use a cleaning solution. While I have a formula for homebrew cleaner, I don't recommend that the average person goes that route since premade cleaner is so easy to find and homebew cleaner can damage the printer (I can get the formula if you want to try, though). In most cases, you can find it in a printer shop or on sites like eBay. Some shops may even offer the cleaning as a service. All you really need to know is that you need to follow the instructions provided with the kit if you buy the cleaner and fix it yourself.
If cleaning it does not help, then you may have air trapped in the printhead or the printhead has failed.
I also need to warn you about this now since you have a wetness sensor Epson :(. If the cartridges are at ~25%, the chips permanently lock into read only mode (if it's low, it's usually at this point). Removing a cartridge in this condition WILL damage the chip and cause the printer to reject them. If you end up removing it and damaging the carts, you will need to replace them. The chips can be replaced, but it's difficult and they're hard to find because Epson is litigation happy against 3rd party ink/chip manufacturers. They will also reset to what the ink previously had and if you were at 25% or less prior, you won't be able to reset the replacement chips you installed.
I'm not exactly fond of Epson (as you can probably tell). Between the use of litigation to protect their ink sales, the use of wetness sensors (introduced with the 88/69/68), self bricking chips (with reset lockout) and the reduction in waste ink pad capacity, Epson is not a brand I would recommend to anyone at this point. I personally drew the line at the waste ink pads.
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