Troubleshooting Guide • Homeowner Manual
18
Troubleshooting Assistance
Guide
No Heat/No Cool/No Fan (common problems)
Possible Cause
Corrective Action
Blown fuse or tripped
circuit breaker.
Replace fuse or reset breaker.
Furnace power switch
set to
OFF
.
Turn switch to
ON
.
Furnace blower
compartment door or
panel is loose or not
properly installed.
Replace door panel in proper position to engage
safety interlock or door switch.
No Heat
Possible Cause
Corrective Action
Pilot light not lit.
Re-light pilot.
System switch not set
to HEAT.
Press SYSTEM button one or more times
to select
HEAT
and press
to raise the
temperature setpoint above room temperature.
Loose connection to
thermostat or system.
Verify thermostat and system wires are securely
attached.
Furnace Lock-Out
Condition. Heat may
also be intermittent.
Many furnaces have safety devices that shut down
when a lock-out condition occurs. If the heat works
intermittently, contact the furnace manufacturer or
your HVAC contractor for assistance.
