Honeywell CT41A Instructions D'installation page 4

7
TROUBLESHOOTING
Your Honeywell Thermostat requires little or no attention. Most problems can generally be traced to the following:
NOTE: If your system is heating-only or air conditioning-only, disregard sections not applicable to your system.
Symptom
No heat
Furnace turns on and
off.
Major swings in
temperature (greater
than 1° C [2° F] when
outside temperature
is stable).
Thermostat setting
and thermometer
reading disagree.
No air conditioning.
69-0848B
Problem
System switch at OFF or COOL
position.
Blown fuse or tripped circuit
breaker.
Furnace power switch is at OFF.
No pilot flame.
Improper connections to
thermostat.
Defective thermostat. (Here's how
you know: Remove the
thermostat from the wall.
Disconnect wire from W terminal.
The thermostat is defective if the
burner comes on.)
Other.
Burner on period is too short.
Burner on period is too long.
Thermostat is not level.
Thermostat affected by drafts or
radiant heat.
Thermostat is out of calibration.
Thermometer is out of calibration.
System switch is in OFF or HEAT
position.
Blown fuse or tripped circuit
breaker.
Compressor switch (located
outdoors) is at OFF.
Improper connections to
thermostat.
Defective thermostat. (Here's how
you know: Remove the
thermostat from the wall.
Disconnect wire from Y terminal.
Touch Y wire to terminal R. The
thermostat is defective if the
compressor starts. Some systems
have a time delay, so allow at
least five minutes.) See
CAUTION in step 5.
Other.
Corrective Action
Move switch to HEAT position.
Replace fuse or reset circuit breaker.
Switch to ON.
Relight pilot flame per furnace manufacturer instructions.
With power to furnace at OFF, tighten all mounting and
terminal screws. Repair frayed or broken wires.
Exchange the thermostat. See Warranty.
Contact a qualified service technician for assistance.
Remove the thermostat cover and move the heat
anticipator lever counterclockwise
Replace the cover and wait several hours for the system
to stabilize.
Remove the thermostat cover and move the heat
anticipator lever clockwise
the cover and wait several hours for the system to
stabilize.
Recheck the thermostat position on the wall. Use bubble
level to make sure it is level. See step 4.
Contact a qualified service technician to change the
location. The thermostat should be about 1.5m [5 ft]
above the floor and on an inside wall.
Contact a qualified service technician to recalibrate the
thermostat.
Recalibrate. See step 8.
Move switch to COOL position.
Replace fuse or reset circuit breaker.
Move switch to ON position.
With power to furnace OFF, tighten all mounting and
terminal screws. Repair broken wires.
Exchange the thermostat. See Warranty.
Contact service technician for assistance.
4
one scale mark.
one scale mark. Replace