Technical Articles

FAQ - My heater shuts off while I am in the shower or using the sink in the kitchen, why? There are no error codes on my remote.

This type of problem is typically caused by low water flow.  Noritz tankless water heaters have a minimum flow requirement (0.5 gpm for most models.)  If this flow requirement is not met, the heater will not fire.

If you heater shuts off during usage, here are a few things to check:

  • Ensure your filter is clean and free of debris (instructions)
  • Verify gas, water, and power are supplied to the heater
  • Try lower your water temperature to 120°F.  This will ensure you are using more hot water and meeting the minimum flow rate requirement.

If you are still having problems, please contact a local Noritz Service Agent, listed at, or Noritz Technical Support at 1-866-766-7489

Applicable Models
  • Models: ALL MODELS
There are no attachments for this article.
Comments Comments
Please add a comment if you would like to provide us with feedback about this article. We will carefully analyze your feedback and use it to improve our Articles, but we will not reply to you. If you have an issue that requires a reply, please click here to contact us. If you have an urgent matter that needs immediate assistance, please call us at 866-766-7489. Otherwise, please feel free to search our website for what you need. Thank you for choosing Noritz!

Related Articles

There are no articles in this section.

Articles in same category

FAQ - What maintenance is recommended?
Viewed 16223 times since Fri, Sep 30, 2011
FAQ - I recently had my tankless unit installed, why don’t I get hot water at all my fixtures?
Viewed 7032 times since Mon, Oct 3, 2011
FAQ - What does the flow meter alarm set button do? What does 990 mean?
Viewed 21014 times since Fri, Sep 30, 2011
Article Rating (17 Votes)
Rate this article

Subscribe to Knowledgebase

Get notified when Knowledgebase articles are added or updated.
Get notified when Knowledgebase articles are added or updated.
Copyright © 2020, NORITZ AMERICA CORP.All Rights Reserved