How to Fix Noritz Error Code 11

How to Fix Noritz Error Code 11 Get a free Noritz tankless water heater guide https://www.monkeywrenchplumbers.com/... Even the best tankless water heaters will pop an error code once in a while. Some error codes crop up more often than others, though. For Noritz tankless water heaters, the stubborn error code 11 is one of the most commonly seen error codes. For over 15 years, we’ve been servicing tankless water heaters that display all sorts of error codes. From codes caused by blockages in the exhaust venting to dirty aerators on an interior fixture tripping the tankless water heater, we’re hardly surprised by anything we come across in the field. Noritz code 11 is no different.