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TACO SR501-4 / Honeywell Digital Thermostat RTH6500
I just installed a Honeywell Digital Thermostat RTH6500 to a TACO SR501-4. The issue I have is when the boiler kicks on to heat up to temp 170 degrees, the green light on the SR501-4 goes out and then comes back on once the boiler reaches the temp of 170 degrees. Is this normal?
When the thermostat request heat the red lights come on and goes off once the temp is reach which I know is normal.