Taco S502 Red Light
What does the red light indicate? Just noticing it and should I be concern?
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Hi @lmm18745
According to the instruction sheet the red light indicates that the thermostat is calling for heat.
Here's what it says:
External Diagnostics:
Externally visible lights show full functionality of the switching relay. The green light should always be on, indicating that power is connected. When the thermostat calls for heat, both the appropriate circulator and red indicating light is energized
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