Navien Error Code E822: Overcooling of the air conditioning coil (Evaporator coil).
Severity
Warning
Type
digital display
Estimated repair cost:$100 — $250(parts + labor)
Warning: Your Navien air conditioner has detected that the evaporator coil is too cold, which can cause icing and system shutdown. This requires diagnosis and repair.
How to Fix Navien Code E822
Step 1: Check and replace your air filter. A dirty air filter is the most common cause of restricted airflow.
Step 2: Ensure that all supply and return air vents are open and not blocked by furniture or other obstructions.
Step 3: After completing steps 1 and 2, reset the unit by turning it off and then back on at the breaker. If the error reappears, call a qualified HVAC technician.
How to Reset Navien Code E822
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 E822 mean?
The E822 error code on your Navien indicates that the evaporator coil in your air conditioning system is experiencing overcooling. This typically happens when the coil gets too cold, often leading to ice formation. This icing restricts airflow, reduces cooling efficiency, and can potentially damage the compressor if left unaddressed. The Navien system is designed to shut down to prevent further damage when this condition is detected. Think of it like your car overheating – the system is protecting itself.
Overcooling of the air conditioning coil (Evaporator coil).
This error occurs when the supply air (SA) temperature is abnormal. ● Check the status of the air conditioning coil (Evaporator coil). ● Check if the duct’s filter is clean. ● Check if the set cooling airflow is suitable for the cooling capacity.