Rinnai Code 25 — Condensate Neutralizer Maintenance

What Causes Rinnai Code 25?

On condensing Rinnai units (RU-Series), this code indicates the condensate neutralizer cartridge needs replacement. This is a routine maintenance item, not a fault.

How to Fix Rinnai Code 25

We stock Rinnai condensate neutralizers and can replace them during a standard service call. This code will keep returning until the neutralizer is replaced.

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.