How to Fix Epson L1800 Error 43h: Printhead Temperature Failure Troubleshooting

Question: 

I am having an issue with my Epson L1800 printer? The red paper light turns on, and when I run the proceed code I get error 43h. Can you please help and tell me how I can fix this or what parts I might need. Thank you in advance!

Answer:

Pattern of Error 43h on the Epson L1800

Error 43h means Printhead temperature has failed This indicates that the printer has recognized an irregular temperature in the printhead, which can be attributed to factors like a malfunctioning printhead, an issue with the mainboard, or problems regarding ink movement and cooling.

Possible Causes and Fixes

Printhead Failure

A defective printhead is the most frequent error 43h issue. It is triggered by your printer when there is not enough cooling or the temperature sensor inside the printhead fails, causing to the print head increase heat.

Solution:

Turn off the printer and allow it to cool down for at least 30 minutes.

Make sure to look out for signs of ink blockage around the printhead. If so, carefully clean it with a better cleaning solution.

If this doesn’t resolve the problem, you may need to replace the printhead. To accompany your Epson L1800 printhead replacement, look for reliable suppliers, or go with compatible parts from BCH Technologies.

Mainboard Failure

If the printhead is good but the alarm does not go away there might be a problem in the printer's mainboard as well. There is a mainboard which regulates printhead temperature responsible for the failure to read failure in this system false temperature readings.

Solution:

Check the printer for any physical damage to the ribbon cable from the printhead to the mainboard. The reason could be a loose or damaged cable leading to communication noise.

If that's an option, try swapping out the ribbon cables first before replacing the mainboard.

If it's not a cable, then you will have to replace the mainboard.

Falling Output From Ink Flow Problems Overheating

Many Epson printers use ink flow for printhead cooling. Incorrect ink flow can lead to printhead overheating.

Solution:

Make sure the ink cartridges or ink tanks are filled properly, and make sure there are no air bubbles, no clogs in the ink tubes.

For CISS, ensure the system is properly primed and ink is flowing to the printhead.

Also running a nozzle check can potentially determine if certain nozzles may have partially clogged and causing the overheating issues.

Professional Help: When to Seek It

The solutions above have brought you no relief and error 43h persists, then you will probably need a professional diagnosis. In these types of situations, the cost to repair the printer can exceed that of replacing it (e.g., replacing both the printhead and the mainboard).

Interim Solutions: Refurbishment or Reclamation

Now, if fixing the printer isn’t an option, you have options:

Search Google Maps for "printer repair near me" and look for local printer repair services.

Post the printer on eBay (https://www.ebay.com/) or Facebook Marketplace (https://www.facebook.com/marketplace/) as “for parts only.”

Recycle it via Epson’s Recycling Program or Best Buy’s e-waste program.

Our Repair Services

Bugging printer is a complicated affair because of the problems which require hands-on attention. Sorry about that, but we do not provide remote troubleshooting, recommendations or support for printer repairs. But what we have is an in-house evaluation, diagnostics, and repair at BCH Printer Repair Service (https://bchtechnologies.com/printer-repair-service), and due to extreme demand, running on a first-come, first-serve basis with a wait time that may reach several weeks. We have you covered whether it is a complete printer repair or a specific part that needs to be changed, and guide you on exactly what to do.

Even so, our repair prices may not be the cheapest option for everyone. We always promote DIY, and there is a ton of troubleshooting videos on our YouTube channel (https://youtube.com/@bchtechnologies) If you need assistance locating a specific repair guide, utilize the search bar on our channel’s homepage.

Thanks again for getting in touch! Do let us know if you need assistance with your Epson L1800 and we will be happy to assist you. We’re happy to provide more information if you have additional questions!