Isata 5 tankless water heater
Thanks, all, for your helpful comments. So here's what we think happened and what we did. The pressure sensor that senses whether the exhaust fan is on was not working. Tried to clean out the atmospheric sense port but that didn't work. Was able to get how heater to turn on by bypassing the sensor. Will remove sensor and see if I can clean it and check to see if that does it. If not, will have to replace the part. When showering, hot water cut out after a few minutes. ?high temp cut off relay? Will try to track down after fixing the pressure sensor.
Also, was surprised to find out that the water level sensor is not analog....only has a few set points giving levels. When it hits 1/3, that was the last warning before going empty. The sensor for "full" level fell off the tank. What should I use to glue it back onto the tank?
Any help is welcome!