Rinnai Code 14 — Thermal Fuse Failure

What Causes Rinnai Code 14?

A serious fault indicating the thermal fuse has blown due to overheating. In Los Angeles, this is almost always caused by scale buildup in the heat exchanger that went unaddressed.

How to Fix Rinnai Code 14

The thermal fuse requires replacement AND the heat exchanger needs descaling. If you have code 14, call us immediately — operating the unit further risks permanent damage.

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.