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TROUBLESHOOTING
8
CONTINUED FROM PAGE 7
Symptom
Furnace Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
Thermostat Setting and Thermostat
Thermometer Disagree
Blank Display and/or Keypad Not
Responding
Heat Setpoint will not Respond
to the Temperature Up Key
Cool Setpoint will not Respond
to the Temperature Down Key
Possible Cause
1. The location of the thermostat and/or the
size of the Heating System may be
influencing the cycle rate.
1. The location of the thermostat and the size
of the Cooling System can influence the
cycle rate.
1. Thermostat thermometer setting requires
adjustment.
1. Voltage spike or static discharge.
1. The desired setpoint conflicts with the
setpoint of the COOL mode.
1. The desired setpoint conflicts with the
setpoint of the HEAT mode.
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Corrective Action
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.
The cycle rate for cooling is fixed and can not be
adjusted. Contact a local service person for
suggestions.
The thermometer can be adjusted +/- 3 degrees.
See Temperature Display Adjustment in the
Operation section.
Use the Reset Operation listed above.
Change system mode to COOL. Raise the Cool
setpoint. Return to HEAT mode and set desired
temperature.
Change system mode to HEAT. Lower the Heat
setpoint. Return to COOL mode and set desired
temperature.
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