I have a second tankless heater in our home and it has worked great for a number of years. Over the last few months it has randomly stopped lighting and now will not light at all. I have cleaned the pilot and burners, replaced the main water valve and have tried to bypass the pilot by using a torch with no luck. I think its either the main control box which is not tripping the ignitor or maybe a ECO overheat sensor, neither one is cheap but I'm looking to see if anyone has experience troubleshooting or a service guide for them.
Here is a link to user guide and parts listing.... user manual
Just parts info ... parts diagram
Here is a link to user guide and parts listing.... user manual
Just parts info ... parts diagram