Met with Bill and proceeded to resolve his issue of the Navien Combi boiler cutting on and off erratically on occasions. After speaking with Bill to gather information. I decided to call Navien tech support to assist in diagnosing the unit. I found the transformers connections to the flame rod compromised and the flame sensor/igniter covered in rust and debris. I cleaned off the igniter/sensor and secured the connections. The unit is under warranty and Navien has agreed to send out the replacement parts. Parts will be overnighted to the office. Bill was very happy with the service. 11/30/22 Returned to replace the igniter along with a new transformer and wiring harness. Bill was very happy once again.