Faulty Tagaki M1 Water heater after 8 months - Anyone Familiar?

Question

For the last 2 weeks water may run cold after a 15 minute shower, now it just gave out completely. Has a "991" error - Burning Error. It is getting gas, and water, I've tried cleaning the filter and resetting the unit. It always comes back to the "991" error. Any suggestions? I am hesitant to contact them for warranty repair because they say in the manual that it will not be covered unless installed by a licensed plunber, but it was installed by a unlicensed plumber. I'm pretty sure the problem is not related to the installation.

Answer 1

Follow the link below and submit a question with the error code. Most tech departments will answer questions without ownership info.