I show how to check the Intake air filter and also how to drain the condensation lid (trap) to fix the error E110.

Update: I called Navien Technical Support and they mentioned the condensation lid (trap) that I removed is suppose to be filled with "some water" but if it gets to full it will need to be drained to reset the E110 error code. Question: Why would there be getting to much condensation build up in the pipes and not draining correctly?