- With your thermostat turned on, press Clock twice
- Use the Up/Down keys to set the hours
- Press H to confirm the setting
- Use the Up/Down keys to set the minutes
- Press H to confirm the setting
- Use the Up/Down keys to set the day of the week
- Press A to accept and store
Note: Your Slimline Thermostat does not have Auto BST correction so you will need to adjust the clock for summer/winter time.