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1. Do you have the red to R and white to W
2. Is switch for cycle rate set to left (OFF)?
Should be on back
Yes is it set to gas ?
Do you have a cool,off heat selector and if so is it set to heat?
OK if set for gas, fireplace starts when manually jumping tstat but not through thermostat, you may have a millivolt system that requires a millivolt rather than a 24v thermostat
If the fireplace is millivolt, the 24v stat will not work.You will need a millivolt stat like link I sent.Look on gas valve and see if it says 750 millivolt or 24 volt
The thermostat is basically just a light switch.However if the fireplace is millivolt rather than low volts, often the thermostat is not capable of sending millivolt signal through
It sounds like fireplace must be millivolt.If so, yes. You will need a millivolt stat rather than a 24v stat.
HomeDepot has the CT33A which will work
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