White-Rodgers 70 Series Thermostat Line Extension
39
Troubleshooting
Symptom
Possible Cause
Corrective Action
No Heat
No Cool
No Fan
(common problem)
1.) Blown fuse or tripped circuit breaker
2.) Furnace power switch to OFF
3.) Furnace blower compartment door panel loose or not
properly installed
4.) Loose connection to thermostat or system
1.) Replace fuse or reset breaker
2.) Turn switch to ON
3.) Replace door panel in proper position to
engage safety interlock or door switch
4.) Tighten Connections
No Heat
1.) System Switch not set to Heat
2.) Loose connection to thermostat or system
3.) Heating System requires service or thermostat requires
replacement
Verify thermostat and system wires are securely
attached.
Diagnostic: Set System Switch to Heat and raise
the setpoint above room temperature. Within five
minutes the thermostat should make a soft click
sound and “Heat On” should appear on display.
This sound indicates the thermostat is operating
properly. If the thermostat does not click, try the
reset operation listed below. 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.
No Cool
1.) System Switch not set to Cool
2.) Loose connection to thermostat or system
3.) Cooling System requires service or thermostat requires
replacement
Verify thermostat and system wires are securely
attached.
Diagnostic: Set System Switch to Cool and lower
setpoint below room temperature. Same
procedures as diagnostic for “No Heat” condition
except set the thermostat to Cool and lower the
setpoint below the room temperature. There may
be up to a 5 minute delay before the thermostat
clicks in Cooling if the compressor lock-out option
is selected in the installer menu. (see INSTALLER
MENU, item 50)
