Thermostat displays 'Filter' or maintenance reminder and may limit operation until reset.

Safety first: Turn off power to the furnace/air handler before replacing filters or opening panels.

• Step 1 – Replace filter: Remove the existing air filter from the return grille or furnace and replace it with a new filter of the correct size and rating.
• Step 2 – Service accessories: If the reminder is for a humidifier pad or UV lamp, replace those components per Carrier's maintenance schedule.
• Step 3 – Reset reminder: In the thermostat's maintenance menu, reset the filter or accessory timer.
• Step 4 – Restore power and test: Turn power back on and verify normal operation.