Navien Water Heater Error Code 110: How to Fix It

Q: What causes Navien error code 110?

Error code 110 is caused by blocked exhaust venting, which can result from debris in the vent pipe, damaged vent components, clogged air intake filters, or improper vent installation. Weather conditions like heavy snow or ice can also cause temporary blockages.

Q: Is it safe to use my water heater with error code 110?

No, never override or ignore error code 110. This safety feature prevents carbon monoxide buildup by shutting down the unit when proper ventilation is blocked. Using the water heater with this error could be dangerous.

Q: How often should I clean my Navien water heater vents?

Inspect and clean the exterior vent termination every 3-6 months, and replace the air intake filter annually or more frequently in dusty environments. Seasonal cleaning before winter is especially important to prevent ice and debris buildup.

Q: Can weather cause Navien error code 110?

Yes, severe weather like heavy snow, ice storms, or strong winds can cause temporary vent blockages. Ice formation at the vent termination is common in cold climates and may require careful removal to restore proper function.

Q: What if error code 110 keeps coming back?

Persistent error code 110 typically indicates internal vent component damage, improper vent sizing or installation, or blockages deep within the vent system that require professional cleaning. A certified technician should inspect the entire venting system.

Abstract

Navien error code 110 indicates a vent blockage that's preventing proper exhaust ventilation from your water heater. This safety feature shuts down the unit to prevent dangerous carbon monoxide buildup. The good news is that most vent blockages can be cleared with basic maintenance and inspection.