Navien E027 — Scale Buildup Alert

What Causes Navien E027?

Navien's dedicated hard water warning. The unit has detected conditions consistent with significant mineral scale accumulation in the heat exchanger. Extremely common in Los Angeles.

How to Fix Navien E027

Schedule a descaling service. This code means scale is already affecting performance. In LA we recommend annual descaling to prevent this code from appearing.

When to Call a Professional

Call Simple Water Heater & Filtration if:

• The error code returns after resetting
• You are not comfortable working with gas appliances
• The unit is making unusual sounds alongside the error
• This is the second time you have seen this code in the past year

We are factory-trained on Navien and provide repair service throughout Los Angeles, the San Fernando Valley, Westside LA, and Ventura County.