I have a Honeywell RTH2300B Thermostat that I just installed. My heating system is a boiler with baseboard heat. I have three floors in my house and I have a thermostat on each floor. I only have three wires for each thermostat, a R, G, and W. When I hooked up the new thermostats the heat turned on but will not shut down. I have tried overriding it with the hold button but nothing works to shut off the heat. I have put back my old mercury thermostats until I can figure this out. Should there maybe be a jumper in there or something else? An ideas?