Questions & Answers for: honeywell rth7400d

...Honeywell RTH7400D programmable thermostat installed and working fine, except that I cannot change the display settings from farenheit to celsius. The package stated that it was both farenheit and ...

...RTH7400D My Honeywell thermostat, model #RTH7400D is blowing out cold air as it's supposed to and set to 76 however, the room temperature is stuck at 80. After checking the room with another ...

...honeywell RTH7400D thermostat to 3 wire hot water need to wire a honeywell RTH7400D thermostat to an old boiler/hot water radiator system, with a 3 wire. Thx. Just mark the old wires on the old ...

...Honeywell thermostat RTH7400D. In the winter I keep getting cooling with electric furnace. I have been over and over the wires and thermostat settings. any help is appreciated. Some of the old heat ...

installed honeywell rth7400d and now my system is freezing up condensor not coming on after i installed honeywell programable thermostat a/c unit freezing up. Is this a heat pump unit?

honeywell rth7400d This thermostat is 8 years old..Has been working fine for ac and heat for years....but last heating season we noticed that when the heat is to kick up from the sleep mode, say from ...