Honeywell TH5220D Installation Guide
![Honeywell TH5220D Thermostat manual cover](/images/YmYjbWnpocCZiRjNhlBVGlfo/thumbs/thumb175x175.webp)
To set the temperature, press the "Up" or "Down" arrow buttons on your thermostat until you reach your desired temperature setting. Ensure that the system is set to either "Heat" or "Cool" depending on your needs.
First, check if the thermostat is properly powered. Ensure the batteries are fresh and correctly installed. If it's hardwired, verify there's no tripped circuit breaker. If the issue persists, consult a professional technician.
To reset your thermostat, turn it off by setting the system switch to the "Off" position. Wait for a few seconds, then turn it back on. This can resolve minor glitches.
Check if the thermostat is set to "Auto" mode, which allows it to automatically switch between heating and cooling. Ensure there's no programmed schedule overriding your settings.
To change the batteries, gently pull the thermostat off its wall plate. Replace the old batteries with new AA alkaline batteries, ensuring correct polarity, then snap the thermostat back onto the wall plate.
The "Cool On" or "Heat On" indicator shows that the thermostat is in cooling or heating mode and actively calling for the system to run. If it’s flashing, the system is in a delay mode.
Press the "Set" button until the schedule setting appears. Use the arrow keys to set your desired time and temperature for each period, and press "Set" to confirm each setting.
Check if the thermostat is locked. If so, unlock it using the designated method in the manual. Ensure the system switch is set to your desired mode and check if the circuit breaker is tripped.
Yes, the Honeywell TH5220D is compatible with most dual fuel systems. However, it may require professional installation to ensure correct configuration.
The "Filter" message is a reminder to check and possibly replace your HVAC system's air filter. After replacing the filter, reset the reminder by following the instructions in your user manual.