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8
TROUBLESHOOTING
CONTINUED FROM SIXTH PAGE
Symptom
Possible Cause
Corrective Action
No Heat (continued)
Heating system requires service or
1.
raise thermostat requires replacement.
Diagnostic: Set SYSTEM Switch to
HEAT and the
setpoint above room temperature. Within a few
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermostat
is operating properly. If the thermostat does not click,
try the reset operation listed above. If the thermostat
does not click after being reset contact your heating
and cooling service person or place of purchase for
a replacement. If the thermostat clicks, contact the
furnace manufacturer or a service person to verify the
heating is operating correctly.
No Cool
SYSTEM Switch not set to COOL.
1.
Loose connection to thermostat or
2.
system.
Cooling system requires service or
3.
thermostat requires replacement.
Set SYSTEM Switch to
COOL and lower setpoint
temperature below room temperature.
Verify thermostat and system wires are securely
attached.
Same procedure as diagnostic for No Heat condition
except set the thermostat to
COOL and lower the
setpoint below the room temperature. There may be up
to a five minute delay before the thermostat clicks in
Cooling.
Heat, Cool or Fan Runs
Constantly.
Possible short in wiring.
1.
Possible short in thermostat.
2.
Possible short in heat/cool/fan system.
3.
FAN Switch set to Fan
4.
ON.
Check each wire connection to verify they are not
shorted or touching together. No bare wire should
stick out from under terminal screws. Try resetting the
thermostat as described above. If the condition persists
the manufacturer of your system or service person
can instruct you on how to test the Heat/Cool system
for correct operation. If the system operates correctly,
replace the thermostat.
Furnace Cycles Too Fast or
Too Slow (narrow or wide
t
emperature swing)
The location of the thermostat and/or
1.
the size of the Heating System may be
influencing the cycle rate.
Digital thermostats normally provide precise
temperature control and may cycle faster than
some
older mechanical models. A faster cycle rate means
the unit turns on and off more frequently but runs for
a shorter time so there is no increase in energy use. If
you would like to increase the cycle time, clip Jumper
W-905 as mentioned in the instructions for Hydronic
Heating Systems. It is not possible to shorten the cycle
time. If an acceptable cycle rate is not achieved as
received or by clipping W-905 contact a local service
person for additional suggestions.
Cooling Cycles Too Fast or
Too Slow (narrow or wide
temperature swing)
The location of the thermostat and
1.
the size of the Cooling System can
influence the cycle rate.
The cycle rate for cooling is fixed and can not
be adjusted. Contact a local service person for
suggestions.
Thermostat Setting and
Thermostat Thermometer
Disagree
Thermostat thermometer setting
1.
requires adjustment.
The thermometer can be ad/- 3 degrees. See
Temperature Display Adjustment in the Operation
section.
Thermostat Does Not Follow
Program
AM or PM set incorrectly in program.
1.
AM or PM set incorrectly on the clock.
2.
Voltage spike or static discharge.
3.
Check current clock and program settings including
the AM or PM designations for each time period. If
a voltage spike or a static discharge occurs use the
Reset Operation listed above.
Blank Display and/or Keypad
Not Responding
Voltage spike or static discharge.
1.
Battery change required.
2.
Replace batteries and check heat/cool system for
proper operation. If a voltage spike occurs use the
Reset Operation listed above.
