Warning: Your Navien boiler has detected a low water flow issue, which could lead to system damage if not addressed.
How to Fix Navien Code E515
Check your water supply pressure. It should be between 20-80 PSI. If it's too low, you may need to contact your water supplier.
If you have recently installed a water softener or filter, ensure it's not causing a restriction in water flow.
Contact a professional HVAC technician if you're unable to resolve the issue.
How to Reset Navien Code E515
Turn off the unit using the power button on the front panel.
Turn off the gas supply valve.
Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
Restore power at the breaker, then open the gas valve.
Turn the unit back on. If the error returns, the underlying issue needs repair.
What does E515 mean?
The E515 error on your Navien boiler indicates that the water flow rate is lower than normal. This could be due to a partial blockage in the system, a faulty flow sensor, or an issue with your water supply. It's important to address this issue promptly to prevent potential damage to your boiler.
● Ensure that the electrical cord is properly grounded. ● Reset the boiler from the front panel.
Navien NFB-H Installation & Operation Manual
116
Abnormal PCB
Check PCB connections.
Navien NFC-H Installation & Operation Manual
127
Abnormal operation: PCB component
Manual RESET Alarm
Navien NHB-H Installation & Operation Manual
119
Abnormal PCB
Check PCB connections.
Navien NPF Installation & Operation Manual
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Abnormal WD-PSS1 status
This error occurs when there is abnormal operation in the main controller (PCB). ● If this error occurs continuously, contact Technical Support at 1-800-519-8794.