Honeywell CT5OC - Manual (Page 4)

TROUBLESHOOTiNG
Your Honeywelf thermostat requires little or no attention. Most problems car 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
t e m p e r a t u r e
(greater than 2° F
[1'" C| when out­
side temperature
is stable).
PROBLEM
System switch at OFF or
COOL Position.
Blown fuse or tripped
circuit breaker.
Furnace power switch is
on OFF.
No pilot name.
Improper connections to
thermostat.
Defective thermostat.
(Here’s how you teil:
Remove the thermostat
trom the wall. Discon­
nect wire from W ter­
minal, Touch W wire to
R terminal. The thermo­
stat is detective if the
burner comes on.)
Other,
Burner ON period is too
short.
B u r n e r O N
is too long p e r i o d
CORRECTIVE ACTION
Move switch to HEAT
position.
Replace fuse or reset
circuit breaker.
Switch to ON.
Relight pilot flame per
furnace
manufacturer’s
instructions,
With power to furnace
OFF, tighten at I mounting
and terminal screws. Re­
pair 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 COUNTER­
CLOCKWISE one
scale mark. Replace the
cover and ivait several
hours for the system to
stabilize.
Remove the thermostat
cover and move the heat
anticipator lever CLOCK­
WISE
one scale
mark. Replace the cover
and wait several hours for
the system to stabilize.
SYMPTOM PROBLEM CORRECTIVE ACTION
Thermostat setting
and thermometer
reading disagree. Thermostat is not level. Recheck the ihermostat
position on wall. Use a
bubble level to make sure
it's level. See step 4,
Thermostat affected by
drafts or radiant heal. Contact a qualified service
technician to change the
location. The thermostat
should be about 5 ft [1.5
m] above the floor and on
an inside wall.
Thermostat is out of cali­
bration. Contact a qualified service
technician to recalibrate
the thermostat-
Thermometer is out of
calibration.
Recalibrate See step 8.
No air condition­
ing. System switch in in OFF
or HEAT position.
Move switch to COOL
position.
Blown fuse or tripped
circuit breaker.
Replace fuse or reset
circuit breaker.
Compressor switch (lo­
cated outdoors} is turned
OFF Move switch to ON posi­
tion.
Improper connections to
thermostat With power to furnace
OFF, tighten all mounting
and terminal screws, Re­
pair broken wires.
Defective thermostat.
(Here’s how you tell:
Remove the thermostat
from wall Disconneci
wire from V terminal
Touch Y wire to terminal
R. The thermostat is de-
feclive if the compressor
starts. Some systems
have a time delay, so
allow at least 5 minutes,)
See caution in section 6.
Exchange the thermostat.
See Warranty.
Other Contact service techni-
cian for assistance.
RECALIBRATE THERMOMETER
If the ihermostat 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 rear an
accurate thermometer.
After allowing 5 or 10 minutes for
stabilization, compare the read-
ings.
□ It 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
into operation.