Warning: Your Navien boiler has encountered a system error. It's safe to operate, but needs professional attention.
How to Fix Navien Code E777
Check if the remote control is properly paired with the boiler. Try removing and re-adding it.
Ensure there are no other electronic devices nearby that could be causing interference.
If the issue persists, contact a professional HVAC technician for repair.
How to Reset Navien Code E777
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 E777 mean?
The Navien E777 error code indicates a communication issue between your boiler's main board and the remote control. This isn't an immediate safety concern, but it will prevent you from using the remote to control your boiler. The boiler will continue to function normally using the local controls.