Navien e515 error code

If an error occurs in the internal circuit of the PCB (e.g., resistance, transistor or relay fault), the system displays 515E (cleared manually) on the PCB.

Check items

1. Defective PCB
2. Check with a multimeter if the PCB is supplied with the proper voltage (AC 102~132 V).
3. Check the wire connection.
4. Disconnect the ground wire, then check the PCB