Customer called in after noticing they were receiving an error code from their Navien tank less water heater. Our technician Zach was able to come out same day and diagnose the issue. After going over some questions with the customer, one thing stuck out the most. They failed to get proper maintenance done. After Zach diagnosed the system, he found the intake screen to be severely clogged. He pointed out this would be caught during routine maintenance visit. After a cleaning and descaling of the unit, the customer’s unit was back to working at factory specs. Customer is now a member with a maintenance plan that covers a cleaning for their Navien tank less water heater every year to avoid future issues.