What you'll notice with E515
- Display behaves erratically or goes blank
- Unit unresponsive to the controller
- Often follows a power surge, a flood, or long-term condensate drip
Navien E515 Error Code: Control Board (PCB) Fault
Abnormal operation of the control board (PCB).
Stop and call
Open 24/7 · CSLB #1008381 · Joseph J. Castro, Owner
Quick answer
Navien E515 means: Abnormal operation of the control board (PCB). It's usually caused by board fault, power supply irregularity, or moisture/corrosion damage. The fix: Verify supply voltage and grounding, inspect for moisture damage, and replace the PCB when confirmed failed. Efficient Water Heaters, Inc. diagnoses Navien E515 faults across San Jose 24 hours a day, 7 days a week — (408) 470-0191, CSLB #1008381.
What causes it
Board fault, power supply irregularity, or moisture/corrosion damage.
Safe steps you can take right now
- 1Turn the unit off at the switch and at the breaker.
- 2Look for visible water intrusion around the cabinet.
- 3Call for service — this is not a homeowner repair.
How we fix E515
Before replacing an expensive board we verify supply voltage, polarity, and grounding, and check for moisture or corrosion damage that would kill a new board too. Condensate leaks are the usual culprit.
Verify supply voltage and grounding, inspect for moisture damage, and replace the PCB when confirmed failed.
Get your Navien E515 fixed
Call (408) 470-0191 any hour, or send the form and we'll reach out.
Navien E515 — related services, cities, and codes
E515 rarely shows up alone. These are the services that resolve it, the cities we cover, and the codes that often appear alongside it.