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Hello, Billy is not in right now, I am Phil.
I need the brand and model number of the thermostat to pull the wiring diagram for it, that is stamped on the back of it after you pry it from the wall mount plate. Try removing the wire connections from S1 then S2 first, that will simulate infinite resistance at the sensors.. tell me what happens.. next we can simulate no resistance by shorting each one separately, but NOT *between S1 and S2.
We can go from there.
Hello again, yes you can hook up more than a few common thermostats to the system but not just any thermostat.
Tell me which color wires attach to which letter terminal on the existing thermostat and i can look up some options for you.