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Thread: Hot water heater fan working but no hot water

  1. #1

    Default Hot water heater fan working but no hot water

    Tenants in my condo are complaining that the hot water heater (gas) doesn't work. The 'red light' is on, so it's getting some power, but the water doesn't heat.

    Here's the kicker: twice, when tenants have unplugged and replugged the unit, it fixes the problem.

    Any ideas as to what causes this? Why would 'rebooting' work?
    (important note: I'm not a pro)

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    You need to find the troubleshooting part of the manual. On closed combustion systems, there are numerous interlocks. The system has a vacuum switch that verifies there isn't a leak or break in the exhaust lines. Course, the logic board could be shot, too. It could be something as simple as the vent being obstructed, or a crack or loose joint in one of the vent lines, among many other things. Often, the light will flash a code or something.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Master Plumber master plumber mark's Avatar
    Join Date
    Feb 2005
    indianapolis indiana - land of the free, home of the brave....
    Blog Entries

    Talking power vent water heaters

    I wonder what brand youi have and how old it is????

    most likely its an A.O.Smith and they are trouible...

    it happens a lot that when the control starts acting up

    then you can just unplug it and plug it back in again.......

    its a sure sign of troubles in the circuit board....

    and its more an issue on how old it is and how much you

    want to fool with it........

    if its more than 10 years old, just look for a new one

    you will be money ahead


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