Honeywell TH5220D1003 Owner's Manual

About Honeywell TH5220D1003 Owner's Manual

Feature Honeywell TH5220D1003

Auto changeover (heat/cool)

Auto Changeover is a feature used in climates where both air conditioning and heating are used on the same day. When the system is set to Auto, the thermostat automatically selects heating or cooling depending on the indoor temperature.
Heat and cool settings must be at least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree separation (called “deadband”).
The 3-degree separation between heating and cooling set temperatures is fixed, and cannot be changed.

  1. Press system button until screen displays “Auto”.

NOTE: The Auto system setting may not appear, depending on how your thermostat was installed

Built-in compressor protection

Damage can occur if the compressor is restarted too soon after shutdown. This feature forces the compressor to wait for a few minutes before restarting.
During the wait time, the display will flash the message Cool On (or Heat On if you have a heat pump). When the safe wait time has elapsed, the message stops flashing and the compressor turns on.

Battery replacement

Batteries are optional (for backup power) if your thermostat was wired to run on AC power when installed.
Install fresh batteries when the REPLACE BATTERY warning begins flashing. The warning flashes about two months before the batteries are depleted.
Replace batteries once a year, or before leaving home for more than a month. All settings are permanently stored in memory, and do not require battery power.

Troubleshooting Honeywell TH5220D1003

If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily.

Display is blank

  • Check circuit breaker and reset if necessary.
  • Make sure power switch at heating & cooling system is on.
  • Make sure furnace door is closed securely.
  • make sure fresh AA or AAA alkaline batteries (depending on model) are correctly installed (see page 3).

Heating or cooling system does not respond

  • Press SYSTEM button to set system Heat (see page 2). Make sure the temperature is set higher than the Inside temperature.
  • Press SYSTEM button to set system to Cool (see page 2). Make sure the temperature is set lower than the Inside temperature.
  • Check circuit breaker and reset if necessary.
  • Make sure power switch at heating & cooling system is on.
  • Make sure furnace door is closed securely.
  • Wait 5 minutes for the system to respond.

Temperature settings do not change

Make sure heating and cooling temperatures are set to acceptable ranges:

  • Heat: 40° to 90°F (4.5° to 32°C).
  • Cool: 50° to 99°F (10° to 37°C).

“Cool On” or “Heat On” is flashing

  • Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor (see page 3).

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