E515 🟡 Repair Required
Navien Error Code E515: Low Water Flow
⚠️ 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.
What Does Navien Error Code 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.
Common Causes of Navien Code E515
- Partial blockage in the system, such as scale or sediment buildup
- Faulty water flow sensor
- Issue with your water supply, such as low water pressure
Applicable Navien Models
Source Documentation
This error code is documented in 6 official Navien technical manuals.
NFB-H Installation & Operation ManualPage 116
ReasonAbnormal PCB
ActionCheck PCB connections.
Navien NCB-H Installation & Operation ManualPage 130
ReasonAbnormal PCB
Action● Ensure that the electrical cord is properly grounded. ● Reset the boiler from the front panel.
Navien NFB-H Installation & Operation ManualPage 116
ReasonAbnormal PCB
ActionCheck PCB connections.
Navien NFC-H Installation & Operation ManualPage 127
ReasonAbnormal operation: PCB component
ActionManual RESET Alarm
Navien NHB-H Installation & Operation ManualPage 119
ReasonAbnormal PCB
ActionCheck PCB connections.
Navien NPF Installation & Operation ManualPage 127
ReasonAbnormal WD-PSS1 status
ActionThis 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.
Need a Pro to Fix Navien Code E515?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Navien Tankless Water Heater Code E515
Water Flow Sensor OEM: NAV-00000000000000000000000000000000