I just replaced an old Honeywell thermostat with a new Honeywell RTH230B. I have hot water baseboard heat, no AC - a 2 wire installation. For some reason it works in heating mode but never shuts off when it reached the set point.
Any idea what is wrong? Do I have the wires reversed? They are installed the same way they were on the last thermostat.
Thanks in advance for the help.