Navien Tankless Water Heater Error Code 050: How to Fix It

Q: What does error code 050 mean on a Navien water heater?

Error code 050 indicates that the freeze protection feature has been activated because the internal temperature of the water heater has dropped too low. This typically happens in freezing conditions when cold air enters the unit or water lines freeze.

Q: How do I clear error code 050 on my Navien?

First, shut off the unit and allow it to thaw completely. Then press and hold the Reset button on the controller for 3 seconds. If the error returns, there may still be ice inside or a more serious issue.

Q: Can I prevent Navien error 050 from happening?

Yes. Ensure the venting is properly installed and not allowing cold air backdraft. Insulate exposed water pipes and the unit itself if it's installed in an unheated space. Keep the unit's anti-freeze setting enabled if available.

Q: Is it safe to use a hair dryer to thaw my Navien?

Yes, as long as you use low heat and keep the hair dryer moving. Do not concentrate heat on one spot or use high heat, as it can damage plastic parts. Never use an open flame.

Q: What if my Navien still shows error 050 after thawing?

If the error persists after thawing and resetting, there may be internal freeze damage or a faulty freeze sensor. Contact a professional technician for diagnosis and repair.

Abstract

Error code 050 on your Navien tankless water heater means the freeze protection feature has been activated because internal temperatures are too low. This usually happens when the unit is exposed to freezing conditions, often due to cold outdoor air entering through the vent or inadequate insulation. If left unresolved, the heater won't operate and internal components may be at risk of freezing damage.