Rinnai Code 12 — Flame Failure During Operation

What Causes Rinnai Code 12?

The burner ignited but flame was lost during operation. Causes include unstable gas pressure, a dirty flame sensor, or a failing gas valve. Can occur during high-demand periods in LA.

How to Fix Rinnai Code 12

If code 12 appears repeatedly, the gas valve or flame sensor likely needs replacement. Call us for diagnosis — this is a repair in most cases.

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 Rinnai and provide repair service throughout Los Angeles, the San Fernando Valley, Westside LA, and Ventura County.