Tankless takes several tries to fire up

Discussion in 'Tankless Water Heater Forum' started by doxviper, Apr 24, 2019.

  1. doxviper

    doxviper New Member

    Apr 24, 2019
    Loveland, CO
    We have enjoyed our Paloma tankless water heater care free for over 10 years. Recently on occasion it has taken 2 or 3 times turning water off and on again to get the heat going. We get an error code 11 when it fails to ignite. So far it has not failed to ignite after 2 or 3 tries. I've never done any maintenance on it. I did the installation myself along with the electrical changes for high altitude operation. Do these symptoms indicate a course of action I can take to correct the trouble myself?
  2. WorthFlorida

    WorthFlorida Broad-Wing Hawk

    Oct 28, 2009
    Orlando, Florida

    I know nothing about this unit but since error code 11 has something to do with gas ignition I would look into three things. 1) something must sense gas pressure and 2) this is causing the gas valve to remain close or the gas valve is failing to open, or 3) the ignition circuit is failing. The Paloma web site list 11 items to check.
    You should call a company that can service it, however Paloma web site has a support page that list some common problems and fixes. If you can get a tech that normally services these units, they’ll usually know what parts generally fail with certain error codes. You don’t want to throw parts at it to see if it fix the problem especially dealing with gas.
    Last edited: Apr 25, 2019
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  4. Dana

    Dana In the trades

    Jan 14, 2009
    A dirty/varnished or defective flame sensor is the most common cause for tankless water heaters to report an ignition failure error. Buffing it up with a plastic scouring pad (eg SkotchBrite) will often "fix" it. Don't use emery cloth, sandpaper, steel wool, or other hard abrasives for cleaning the flame sensor, since that tends make the problem recur quicker.
  5. plumber69

    plumber69 In the Trades

    Jun 20, 2014
    Prince Rupert, British Columbia
    Its so easy to do, use anything you got to clean it
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