Smart Recovery (Heating Mode Only) — The ther-
mostat has 2 programmed schedule modes, Normal Occu-
pied mode and Setback mode (a time when the space is un-
occupied). The Smart Recovery function begins 1.5 hours
before the Scheduled Occupied mode and gradually adjusts
room temperature so the temperature is at the Occupied mode
set point when the occupied time period begins.
TROUBLESHOOTING
PROBLEM SOLUTION
LCD display on thermostat not illuminated
Check for 24 vac between R and C at terminal connections. Both R and C
must be connected for proper thermostat operation.
‘‘E2’’ displayed on thermostat
Brownout condition or voltage is too low to thermostat. Check wiring and
check for 24 vac at R and C. The E2 error will clear 15 seconds after ac-
ceptable power levels are restored.
‘‘E1’’ displayed on thermostat
Temperature sensor reading is out of range. Check the sensor for damage.
Check sensor wiring. Cycle power to thermostat. If display is not cleared,
replace thermostat.
‘‘Clean Filter’’ is displayed on thermostat
After the configured number of blower operating hours, the Clean Filter mes-
sage will be displayed. This reminds the owner to replace the filter. Press
the Reset Filter button to reset the blower operation timer to 0 hours.
‘‘--’’ displayed on thermostat
If the outdoor thermostat is in error, not connected, or shorted, ‘‘--’’ will be
displayed. Check outdoor thermostat wiring and replace if necessary.
Cooling will not energize
Select COOL mode. Decrease cooling set point to 10 degrees below room
temperature. Simultaneously press Fan and Up buttons to disable timers.
Check for 24 vac at Y/Y2 terminal. If present, thermostat is operating cor-
rectly and problem is with wiring or equipment. If 24 vac is not present, re-
place the thermostat.
Heating will not energize
Select HEAT mode. Increase heating set point to 10 degrees above room
temperature. Simultaneously press Fan and Up buttons to disable timers.
Check for 24 vac at Y/Y2 terminal (for heat pump) or W/W1 terminal
(for gas/electric heat unit). If present, thermostat is operating correctly and
problem is with wiring or equipment. If 24 vac is not present, replace the
thermostat.
LCD — Liquid Crystal Display
Copyright 1997 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 11a 13a
PC 111 Catalog No. 533-313 Printed in U.S.A. Form 33CS-8SI Pg 12 4-97 Replaces: 33CS-6SI
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