Noritz Error 99 — Condensate Drain Blockage

What Causes Noritz Error 99?

On condensing Noritz units, error 99 indicates the condensate drain is blocked. The unit shuts down to prevent water damage.

How to Fix Noritz Error 99

Clear the condensate drain line. If the blockage recurs, the neutralizer may be saturated and causing backup — replace the condensate neutralizer.

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