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

    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.

  2. ballvalve

    ballvalve General Engineering Contractor

    northfork, california
    Thats Chinese for "Made in China"
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