I have a White/Rodgers Model #1F78 Non-Programmable Thermostat connected to a heater in my garage. I live in the upper midwest and the ambient temperature is in the 20-30's in the garage but the display reads 71 degrees so the heater won't kick on. I have installed new batteries with the same result. Is it a bad unit?

SOURCE: 1F78 thermostat change from F to C

yes to cut the wire named W904 at the middle.

SOURCE: No Heat with new White Rodgers 1f85rf-275 Thermostat

The only way to resolve this problem and to distingush if its a thermostat issue on the system is to by pass the thermostat by putting a jumper between the hotwire and the heating wire if the system did run which happen most of the time. Call the HVAC technician to check your heating unit. Or call the White- Rodgers technical line at 18887259797 choose contrator division.

SOURCE: I have the thermostat set for 70 degrees on the

Based on your explanation this is an erratic operation of the thermostat, first thing that you need to check is the wiring make sure that all the wires are proper looped on the under terminals then reset the thermostat if the problem still persist I think you need to replace the thermostat. If you need further support call the homeowner techline 18002842925.

SOURCE: I have a White Rodgers thermostat series 1F78-151

- Check the wires on the terminals make sure that they are not loose
- Reset the unit by press time, up and down buttons make sure the systems is in on position.
- Set the system to cool then and lower the setpoint below room temperature. There may be up to five minute delay before the thermostat clicks in cooling. If the thermostat click this means its not a thermostat you have a problem with your cooling equipment call your installer. If the thermostat did not click the unit should be replaced.

SOURCE: We have the white and rodgers thermostat model

Set System Switch to Cool and lower setpoint below room temperature.
Verify thermostat and system wires are securely attached.
Diagonistic: Set System Switch to Cool and lower the setpoint below the room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation ( . If the thermostat does not click after being reset contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a service person to verify the heating system is operating correctly.

Reset the thermostat by pressing , UP,DOWN and TIME at the same time.