I'm replacing a 23 year old manual Honeywell thermostat with a new digital Honeywell thermostat model RTH111. The old thermostat has two wires (colors white and red) but no designation on the terminals. This is for a hot water baseboard gas fired boiler. Which terminals do these unmarked wires...

I have a honeywell 7 day programmable thermostat (20 yrs old) - the autofan mode stopped working. The heat works only when switched to 'on'. When it is sleep mode/on I have it set to 63, but it goes up to 72. We just replaced the blower motor because it burnt out. Do I need a new thermostat?

I have a RHT7500 series thermostat and when I install it and try to program it the incorrect date displays. Example, Today is Tuesday and it displays Friday as the current date. I was never given the option to set the date/year & time. Also the unit will not work even when turned on. Removed the...

I have a honeywell RTH221, I run the schedule wake, sleep and leave. I want my temp set at all around 73 degrees and for some reason dips to 62 degrees in the middle of the night before turning on again, during the day it drops from 73 degree dipping to 67 degree before turning on again! Is that...

I recently bought a Honeywell RTH230B 5-2 programmable thermostat. Having trouble setting it-- Could someone who knows this stuff tell me simple to understand --How to set this thermostat? It keeps going above the temp I have it set on by as much as 4 degrees.