Navien Error Code E890: Abnormal circulator communication
Severity
Warning
Type
digital display
Estimated repair cost:$100 — $350(parts + labor)
Warning: Your Navien boiler or water heater has stopped working due to a communication problem with the circulation pump. This will prevent hot water and/or heating.
How to Fix Navien Code E890
Step 1: Turn the unit off and then back on again. This might reset the system and clear the error temporarily.
Step 2: Check the wiring around the circulator pump for any obvious damage or loose connections. Do not touch any wires, just visually inspect.
Step 3: If the error persists after restarting, contact a qualified HVAC technician to diagnose and repair the problem.
How to Reset Navien Code E890
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 E890 mean?
The E890 error code on your Navien unit indicates that the main control board isn't communicating properly with the circulator pump. The circulator pump is responsible for moving water through your heating system or to your faucets. Without communication, the system doesn't know if the pump is running correctly, and it shuts down as a safety measure. This can happen due to wiring issues, a faulty pump, or problems with the main control board itself. Basically, the 'brains' of the unit can't talk to the 'muscle' that moves the water.
This error occurs when the cables to the ECM motor are not connected properly. ● Turn off the furnace, turn it on again, and check if the furnace operates properly. ● If this error occurs continuously, contact Technical Support at 1-800-519-8794.