Error 88 — Maintenance required before clearing code

What does 88 mean?

This error code indicates that certain maintenance tasks, such as flushing the heat exchanger or replacing a water filter, should be completed before attempting to clear the code. The unit will not operate normally until this is done.

• Heat exchanger requires flushing
• Water filter needs replacement

Click steps to track your progress.

1. 1

   Perform recommended maintenance like flushing the heat exchanger.

2. 2

   Replace the water treatment filter if applicable.

3. 3

   Turn off gas and water supply to the water heater.

4. 4

   Press the DOWN button until the lowest temperature setting appears on the display.

5. 5

   Press and hold both the DOWN and UP buttons for 5 to 10 seconds.

6. 6

   Turn the gas and water supply back on.