Warning: Your Navien boiler has detected an internal PCB fault. It's safe to use, but needs professional repair.
How to Fix Navien Code E782
Turn off the boiler at the main power switch for 30 seconds, then turn it back on. If the error persists, proceed to the next step.
Contact a licensed HVAC technician for repair. Do not attempt to open the boiler or fix the issue yourself.
How to Reset Navien Code E782
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 E782 mean?
The E782 error on your Navien boiler indicates a fault with the internal Printed Circuit Board (PCB). This is the brain of your boiler, controlling its operations. The fault could be due to a software issue, a damaged component, or a problem with the PCB itself. The boiler will continue to function, but the fault needs to be addressed to prevent further issues.
Abnormal operation: Controller-Panel communication
This error occurs when the controller and panel are not communicated properly. ● Check if the front control panel is connected to the controller properly.