30
TROUBLESHOOTING
YOUR FURNACE
ISSUE
4. Furnace not producing
sufficient heating.
5. Furnace operates but will
not shut off when room
temperature is attained.
POSSIBLE CAUSE(S)
A. Furnace may be too small for
space being heated.
A. Thermostat wiring defective.
B. Thermostat location.
C. Defective thermostat.
CORRECTIVE ACTION
A. Check heat sizing calculations.
A. Thermostat lead wires may be shorted together,
caused by a nail or staple. Check by removing
thermostat leads from valve terminals.
B. Check thermostat location. If on an outside wall,
or there is a hole in the wall behind the
thermostat, cold air may be coming in contact
with the thermostat. Relocate.
C. Check thermostat calibration; verify thermostat
temperature reading; or replace.
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