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TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
No Heat/No Cool/No Fan
(common problems)
No Heat
1. Blown fuse or tripped circuit
breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment
door or panel loose or not
properly installed.
1. Pilot light not lit.
2. Thermostat not set to Heat.
3. Loose connection to thermostat
or system.
4. Furnace Lock-Out Condition.
Heat may also be intermittent.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage
safety interlock or door switch.
Re-light pilot.
Press the
SYSY
SYSY
SY
STEMSTEM
STEMSTEM
STEM button until Heat is displayed
and raise temperature above room temperature.
Verify thermostat and system wires are securely
attached.
Many furnaces have safety devices that shut down
when a lock-out condition occurs. If the heat works
intermittently, contact the furnace manufacturer or
local service person for assistance.