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CT41A HEATING/COOLING THERMOSTAT
5 69-0788-2
Table 2. Recommended Corrective Action for Your System.
Symptom Problem Corrective Action
No heat System switch is at Off of Cool position. Move System switch to Heat position.
Blown fuse or tripped circuit breaker. Replace fuse or reset circuit breaker.
Furnace power switch is at Off. Turn furnace power switch to On.
No pilot flame. Relight pilot flame according to furnace
manufacturer instructions.
Incorrect connections to thermostat. With power to furnace at Off, tighten all
mounting and terminal screws. Repair frayed or
broken wires.
Other. Contact a qualified service technician for
assistance.
Furnace turns on and
off.
Burner On period is too short. Remove the thermostat cover and move the
heat anticipator lever counterclockwise (left)
one scale mark. Replace the cover and wait
several hours for the system to stabilize.
Major swings in
temperature greater
than 2°F (1°C) when
outside temperature is
stable.
Burner On period is too long. Remove the thermostat cover and move the
heat anticipator lever clockwise (right) one
scale mark. Replace the cover and wait several
hours for the system to stabilize.
Thermostat setting and
thermometer reading
disagree.
Thermostat is not level. Recheck the thermostat position on the wall.
Use bubble level to make sure it is level. See
step 3 and Fig. 5.
Thermostat is affected by drafts or radiant
heat.
Contact a qualified service technician to change
the location.
Thermometer is out-of-calibration. Recalibrate. See step 7.
No air conditioning. System switch is in Off or Heat position. Move switch to Cool position.
Blown fuse or tripped circuit breaker. Replace fuse or reset circuit breaker.
Compressor switch (located outdoors) is
turned off.
Move switch to On position.
Incorrect connections to thermostat. With power to system off, tighten all mounting
and terminal screws. Repair broken wires.
Other. Contact service technician for assistance.