How to Lock the Honeywell RTH7500 Thermostat

The Honeywell RTH7500 thermostat controls your domestic heating and cooling system, helping you maintain a comfortable temperature all year round. Locking the thermostat's temperature cancels any heating fluctuations programmed for the day, night or various seasons, instead maintaining a constant temperature within your house 24 hours a day. Canceling the temperature lock resumes normal temperature schedules in your home. Temperature locks help create a temporary environment in your home for special occasions.

Step 1

Locate the "Up" and "Down" soft buttons to the right of the LCD display on your Honeywell thermostat.

Step 2

Tap "Up" and "Down" until the desired temperature appears on the display.

Step 3

Press the button beneath "Hold" on the LCD display. "Permanent Hold" appears on the screen. The thermostat is locked. Pressing the button beneath "Use Schedule" resumes normal thermostat functions.