What the code means
E762: Vent pipe not properly inserted
The Navien manual for this product family lists E762 as: Vent pipe not properly inserted.
Troubleshooting code
Back to all NHB-H Series error codes
Navien NHB-H Series E762 troubleshooting
Vent pipe not properly inserted. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.
Safe checks before calling
- Record the exact Navien code, whether the unit is locked out, and when the code appeared.
- Confirm thermostat, controller, or front-panel status without changing service settings.
- Check only visible intake, exhaust, filter, clearance, condensate, and water-supply conditions that can be inspected without opening panels.
- Take photos of the code, equipment nameplate, venting, surrounding equipment area, thermostat or controller, and any visible leak, ice, or obstruction.
When to stop and call GreenFlow
Call GreenFlow if the code repeats, the unit is locked out, hot water, heating, or cooling is not restored, or the concern involves gas, flame, combustion, venting, electrical components, refrigerant, pressure, water leaks, PCB/control boards, sensors, pumps, or warranty coverage.
Share the visible code, model and serial number if available, photos, current symptoms, and whether the issue affects heating, cooling, or both.
E762 questions
What does E762 mean on a Navien NHB-H Series?
The Navien manual for this product family lists E762 as: Vent pipe not properly inserted.
What should I safely check before scheduling service?
Record the displayed code, confirm thermostat or controller status, check only visible intake, exhaust, filter, clearance, and water-supply conditions, and take photos of the code and nameplate. Do not open gas, electrical, refrigerant, combustion, or internal equipment panels.
When should GreenFlow handle this code?
Call GreenFlow if the code repeats, the unit is locked out, hot water, heating, or cooling is not restored, or the concern involves gas, flame, combustion, venting, electrical components, refrigerant, pressure, water leaks, PCB/control boards, sensors, pumps, or warranty coverage.
Brands We Service
No matching featured brand found.
Popular cities
Service Areas
No matching service area found
Try another nearby city or contact GreenFlow to confirm service availability.
Our Happy Customers
Jenny W.
Great service! On time, knowledgeable & professional
Melissa S.
The repair person came quickly and was super efficient and polite, and showed me what to do next time. He gave my dog a quick pay and was off again.
Jahangir R.
They were very organized to communicate and be on time to come to look at my air condition to fix it.
Dev W.
I had a breakdown of my cooling system and Hanna at Green Flow responded to my request right away. They scheduled me same day. The team at Green Flow was easy to communicate with over phone and text. They kept me updated on delays on arrival of the...