Honeywell RTH7500D Owner's Guide
![Honeywell RTH7500D Thermostat manual cover](/images/FVmduCQuEatAhWwKbFhsFBag/thumbs/thumb175x175.webp)
To reset your Honeywell RTH7500D thermostat, press and hold the 'System' key. While holding it, press and hold the center blank key for 5 seconds. This will display the reset menu.
Press 'Set Clock/Day/Schedule' and then 'Set Schedule'. Use the arrow keys to adjust time and temperature settings for weekdays and repeat the process for weekends.
Ensure the thermostat is set to 'Heat' mode. Check if the circuit breaker is on and that the furnace is receiving power. Also, verify that the batteries are not dead.
A blank display may indicate dead batteries. Replace them with fresh AA batteries and ensure they are inserted correctly. Check the circuit breaker if the issue persists.
To change the batteries, carefully pull the thermostat off its base plate. Remove the old AA batteries and replace them with new ones, ensuring correct orientation.
Yes, you can lock the thermostat by navigating to the 'System' menu and selecting 'Lock'. Follow the prompts to choose the level of restriction desired.
To calibrate, access the Installer Menu by pressing and holding the 'System' and center blank keys. Navigate to function 39 to adjust the temperature offset.
Use a soft, dry cloth to wipe the exterior. Avoid using any liquids or sprays directly on the device to prevent damage to the electronics.
To switch between Celsius and Fahrenheit, press and hold the 'System' key, then press and hold the center blank key. Navigate to function 14 to switch the temperature scale.
Check to ensure the device is properly mounted on its base and that the batteries are correctly installed and not depleted. Reset the thermostat if necessary.