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TROUBLESHOOTING
Table 4 — Thermostat Troubleshooting
PROBLEM
SOLUTION
Display On Thermostat Not Illuminated.
Check for 24 vac at the R terminal connection. Terminal R must be
connected for proper thermostat operation.
‘‘Service Filter’’ Is Displayed On Thermostat.
After the configured number of blower operating hours, the Service
Filter message will be displayed. This reminds the owner to replace
the filter. Reset the Service Filter feature to reset the blower operation
timer to 0 hours.
Cooling Will Not Energize.
Select COOL mode. Decrease cooling set point to 10 degrees below
room temperature. Check for 24 vac at Y1 terminal. If present, ther-
mostat is operating correctly and problem is with wiring or equipment.
If 24 vac is not present, replace the thermostat. Check for Compres-
sor Cycle per Hour Limit. Cooling may be locked out.
Heating Will Not Energize.
Select HEAT mode. Increase heating set point to 10 degrees above
room temperature. Check for 24 vac at W1/O/B terminal. If present,
thermostat is operating correctly and problem is with wiring or equip-
ment. If 24 vac is not present, replace the thermostat.
