If the screen says Schedule on the upper right then it is running whatever is stored in the program. If you use the arrows to change the set temperature it will hold that setting for 3 hours. If you do not want to use the program press the start/stop schedule button to switch to the manual mode. You will not see schedule on the screen. It will ignore all programming and stay on the temperature you set with the arrows.
The flashing or flickering flame indicates that the thermostat is calling for heat. Only on two stage thermostats, if you have a number 2 or two flames then the system is looking to turn on a second stage of heating to help the first stage. This would be due to the fact that the system is calling for more than three degrees or the first stage hasn't been able to raise the temperature by itself.
The flashing snowflake indicates that the thermostat is calling for cooling. Only on two stage thermostats, if you have a number 2 or two snowflakes then the system is looking to turn on a second stage of cooling to help the first stage. This would be due to the fact that the system is calling for more than three degrees or the first stage hasn't been able to lower the temperature by itself.
The high and low limits do not work when auto changeover is used, only in a standard heat or cool mode. The high limit is the highest the heat set temperature may be set to and the low limit is the lowest the air conditioning may be set to.
There is nothing in the thermostat to cause a beep. Perhaps a smoke or CO alarm placed nearby is beeping?
All Robertshaw digital thermostats utilize an electronic temperature sensor and circuitry to control the HVAC system. They are completely mercury free.
Press the UP and DOWN arrows simultaneously for 3 seconds and release. Press and release the FLAME/SNOWFLAKE button until you see CHECK. The filter monitor is adjustable from 0-9900 hours in 100 hour increments with the arrows. When finished press the START/STOP SCHEDULE button to exit.
Press the up and down arrows simultaneously for 2 seconds and release. You will see an F for Fahrenheit or a C for Celsius. Use the up or down arrow to switch between them to the desired selection and press the start/stop schedule button or fan button to exit.