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Carrier 36KCARMS Air Conditioner - Page 7 Questions & Answers
I have a carrier gas furnace and Ac. It's has 4 wires in the system and I labeled correctly and put them in my Honeywell home rth2300 thermostat but now fan runs continuously
The Honeywell RTH2300 doesn't need a C-wire. See the documentation in the Installation & Setup section on the support page:
https://www.honeywellhome.com/us/en/support/air/thermostats/programmable-thermostats/5-2-day-programmable-thermostat-w-change-reminder-rth2300b1038-e1/ . If your old thermostat had a C-wire, check the system board at the furnace. Make sure that the G-wire (usually green) at the thermostat is also connected to the system board's G-wire connection.
First check the obvious: what is the current position of the fan switch? It should be on auto. (That's the switch on the right.)
Is the temperature that the thermostat is reading match the real temperature in the room? Check with a thermometer. If the area near the thermostat is still above (cooling) or below (heating) the set temperature, the room circulation could be a factor. I know my home's thermostat keeps the A/C running for a while after a thermometer on the other side of the living room reaches the desired temperature in the evening when parts of the house are closed off.
If the thermostat temperature reading is correct, the signal may not be reaching the system board. You can check that all of the individual wires between the thermostat and the system control board are undamaged. I've seen those thin wires break when you take them off one thermostat and connect them to another.
Another possibility is that a relay isn't working. Contact Honeywell if the temperature sensor isn't giving the correct reading. Contact a heating and cooling repair person if the problem is with a relay or the system board.
I hope this helps.
Cindy Wells
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