Indicator light on thermostat of a hydronic heating system

Discussion in 'HVAC Heating & Cooling' started by gdave, Jan 24, 2011.

  1. gdave

    gdave New Member

    Messages:
    1
    Location:
    los angeles, CA
    I noticed this indicator light in my thermostat display (marked with a red oval in the picture). I have a hydronic heating system that I have been using for the past 7 months. I never saw this before. Any idea what it is for? I couldn't find any documentation on the thermostat manufacturer's website. This indicator light is always on whether the heater is on or off.

    photo.JPG
  2. ballvalve

    ballvalve General Engineering Contractor

    Messages:
    3,261
    Location:
    northfork, california
    Thats Chinese for "Made in China"
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