Installation Menu
Troubleshooting Guide • 29
10 Troubleshooting Guide
No Heat/ No Cool/ No Fan (Common Problems)
No Heat
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.
Table 10-1
- No Heat/ No Cool/ No Fan (Common Problems)
Possible Cause
Corrective Action
Pilot light not lit.
Re-light pilot.
System switch not set to HEAT.
Press the
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.
Heating system requires service or thermostat
requires replacement.
Diagnostic: Press the
SYSTEM
button to select HEAT and press
to raise the temperature setpoint above 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 described on
Section 10.1.,
Reset Operation
. If the thermostat does not click after
being reset, contact your HVAC contractor or place of purchase for
a replacement. If the thermostat clicks, contact the furnace
manufacturer or your HVAC contractor to verify the heating is
operating correctly.
Table 10-2
- No Heat