Noritz model NRC1111DC/SV Error code 90

Discussion in 'Tankless Water Heater Forum' started by Michael Tourigian, Mar 4, 2020.

  1. Michael Tourigian

    Michael Tourigian New Member

    Joined:
    Mar 4, 2020
    Location:
    Brigantine, NJ 08203
    I have tried everything that Noritz teck has told me to do. Descaled unit, cleaned fan motor, had larger gas meter installed, set dip switches to 2 & 3. I am using 3" PVC pipe and the exhaust pipe in around 12 feet long with two elbows plus a rain cap. I may have a gas pressure issue and may need to get a manometer to check gas pressure at the unit. Before I go through that should I have the gas company come and check out the gas pressure coming into my unit? This has been an ongoing problem for over a year I keep resetting the unit and it will run ok for about 2 weeks then trigger a 90 code not any fun when you are taking a shower. I recently called Noritz again and was told that I could try to change the dip switches to 7 & 3 instead of 2 & 3 which it currently is. Not hopeful that will correct my problem but will try. Any help full comments would be appreciated.
     
  2. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    Ran into something like this, probably is gas pressure, usually a simple adjustment. Running multiple gas appliances at same time along with it can cause it
     
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