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http://Totaline FlatStat P374-1100FM
See page 6 and tell me if your skill levels are up to the task of prying the front of the thermostat from its wall mounted sub base and then using a multi meter to check for 24 volts between the R and C terminals or not,
We can go from there.
Keep that in your files, it does not include the wiring diagram that the first link I send does however. and we need that.
thats the important one the wiring diagram is on page 6, check for 24 voltsAC between R and C,
Tell me if there is wire connected to O or not, if not, fit a jumper between R and Y and tell me if the zone starts cooling or not, we can go from there.
Hello again, we offer advice and assistance trouble shooting, we do not work with any repair or service outfits.
If you do not get 24 volts to that thermostat the problem is with the wiring at the furnace or air handler. If get cooling when you fit the jumper between R and Y the problem is with the thermostat.
Its time to locate the 'Finish and rate' link, and click on it. That is the only way the company pays me for my time and expenses, In exchange I will hold the question open to you for any follow up or advice you might need.