Honeywell CT52A - Manual (Page 6)

TROUBLESHOOTING
Your Honeywell Miermostat requires little or no attention. Most problems can generally be traced to tbe following:
NOTE: [f your system is heating-only or cooling-only, disregard sections not applicable to your system.
SYMPTOM PROBLEM CORRECTIVE ACTION SYMPTOM PROBLEM CORRECTIVE ACTION
No heat System switch at OFF or Move switch to HEAT Thermostat setting Thermostat is not level. Recheck the thermostat
COOL Position. position. and thermometer position on wall. Use a
reading disagree. bubble level to make sure
Blown fuse or tripped Replace fuse or reset it's level. See step 4.
circuit breaker. circuit breaker.
Thermostat affected by Contact service technician
Furnace power switch is Switch to ON. drafts or radiant heat. to change 'ihe location. The
on OFF. thermostat should be about
5 ft [1.5 m] above the floor
No pilot flame. Relight pilot flame per and on an inside wall.
furnace manufacturer’s
instructions. Thermostat is out of call- Contact a qualified service
bration. technician to recalibrate
Improper connections to With Power to furnace the thermostat.
thermostat. OFF, tighten all mounting
and terminal screws. Re-
Thermometer is out of Recalibrate, See step 8.
pair broken wires. calibration.
Defective thermostat. Exchange the thermostat No cooling. System switch in in OFF Move switch to COOL
(Here’s how you tell: Turn (see Warranty). or HEAT position. position.
power to furnace OFF.
Then remove the thermo- Blown fuse or tripped Replace fuse or reset
stat from the wall. Dis- circuit breaker. circuit breaker.
connect wire from W
terminal. Turn power to Condenser switch (lo- Move switch to ON post-
lurnace ON. Touch W cated outdoors) is turned tion.
wire to R terminal. The OFF.
thermostat is defective if Improper connections to With pOvV6r to furosc©
the burner comes on.) thermostat. OFF, tighten all mounting
Other. Contact service technician
and terminal screws. Re-
for assistance.
pair broken wires.
Furnace turns on Burner-on period Is too Ftemove the thermostat Detective thermostat. Exchange the thermostat.
and off. short. cover and move the heat (Here’s how you tell: Turn See Warranty.
anticipator lever COUN- power to cooling system
TERCLOCKWISE V_>
OFF. Then remove the
one scale mark. Wait at
thermostat from wall.
least several hours to sta-
Disconnect wire from Y
bilize. terminal. Turn power to
cooling system ON.
Touch Y wire to terminal
Major swings in B u r n e r - o n p e r i o d Remove the thermostat R. The therrmostat is de-
t e m p e r a t u r e is too long. cover and move the heat fective if the compressor
(greater than 2 F anticipator lever CLOCK- starts. Some systems
[1.1C] when out- WISE _____ J one scale have a time delay, so
side temperature mark. Wait several hours a l l o w a t l e a s t 2 - 3
stable). for the system to stabilize. minutes.)
Other. Contact service techni-
clan for assistance.
RECALIBRATE THERMOMETER
If the thermostat set point and the
thermometer reading do not agree, the
thermometer may need recalibration.
Follow the procedure below.
Remove thermostat cover.
Set the cover on a table near an
accurate thermometer.
After allowing 5 or 10 minutes for
stabilization, compare the read-
□ If the readings are the same,
replace cover and put the system
into operation.
□ If the readings are different, insert
a hex-head wrench in the ther­
mometer shaft and turn it until the
thermometers have the same reading.
□
Replace cover and put the system
nto operation.
!ngs.