it's stuck in permanent hold and i can't get it to go back to following the programmed schedule.

Diagnosis

The Honeywell Home T4 Pro utilizes a "Temporary Hold" and a "Permanent Hold" logic system. When you manually adjust the temperature using the up or down arrows, the device typically enters a Temporary Hold, which lasts until the next scheduled period. However, if the "Hold" button was pressed after a temperature change, or if a specific configuration setting was toggled, the thermostat enters a Permanent Hold. In this state, the device ignores all programmed setpoints for Wake, Away, Return, and Sleep, maintaining a single constant temperature indefinitely. You can confirm a Permanent Hold is active by looking at the main screen. If the display reads "Permanent Hold" instead of "Following Schedule" or "Run Program," the logic board is intentionally bypassing the internal clock and temperature matrix. This often happens accidentally during a temperature adjustment or if the device was set to a "Hold" state during a seasonal change and never toggled back. Because the T4 Pro lacks a physical dial, the software lock requires a specific sequence of button presses to release the override.

How to Fix It

To release a Permanent Hold and return the T4 Pro to its programmed schedule, follow these exact steps:

1. Locate the Hold button on the right side of the interface. Press it once.
2. The screen will toggle between "Permanent Hold" and "Temporary Hold." If it says "Temporary Hold," press the Hold button again until the screen displays Run Program.
3. Once "Run Program" is visible on the display, press the Done button to lock in the change.
4. Verify the current status on the home screen. The text should now indicate the current period (e.g., "Wake") and the words "Following Schedule" should appear.
5. If the temperature immediately jumps to a different setting, do not adjust it; this confirms the thermostat is now successfully following the programmed setpoints.

If That Didn't Work

• Check the Program Setup: It is possible the thermostat is "Following Schedule," but the schedule itself is blank or set to the same temperature for all periods. Press Menu, navigate to Schedule, and verify that there are different temperature setpoints for Wake, Away, Return, and Sleep. If all periods are set to 72°F, it will look like a Permanent Hold even when the program is running.
• Perform a Soft Reset: If the buttons are unresponsive or the "Run Program" option won't stick, remove the thermostat faceplate from the wall bracket. Wait 30 seconds to allow the capacitors to discharge, then snap it back into place. This re-initializes the software without wiping your programmed temperatures.
• Verify Clock Accuracy: If the internal clock is wrong (e.g., it thinks it is 2:00 AM when it is actually 2:00 PM), the thermostat will follow the "Sleep" schedule during the day. Press Menu, select Clock, and ensure the time and day of the week are exactly correct.
• Check for "Vacation Mode": If the device is in Vacation Mode, it overrides all schedules with a single temperature. Press Menu, navigate to Vacation, and select Cancel or Off to return to standard operation.

Heads Up

• Avoid pressing the "Hold" button immediately after changing the temperature; simply adjusting the arrows creates a Temporary Hold that expires automatically at the next scheduled transition.
• Ensure the faceplate is fully seated on the wall plate; a loose connection on the pins can cause intermittent "ghost" button presses that trigger holds.
• If you frequently find the device stuck in hold, check for nearby heat sources (like a lamp or sunny window) that might be causing you to manually override the temperature too often.
• Keep the batteries fresh; low voltage on the T4 Pro can occasionally cause the logic board to glitch and default to a hold state to ensure the HVAC system continues to run.