Troubleshooting - Carrier 33CS Installation, Start-Up, And Operating Instructions Manual

Smart Recovery (Heating Mode Only) —
thermostat has 2 programmed schedule modes, Normal Occu-
pied mode and Setback mode (a time when the space is unoc-
cupied). 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.
DIP SWITCH
CONFIGURATION
Unit Type
AC
HP Y1/W2, O/W2
LEGEND
AC — Air Conditioner
DIP — Dual In-Line Package
HP — Heat Pump
N/A — Not Available
N/C — Normally Closed
N/O — Normally Open
PROBLEM
LCD display on thermostat not illuminated
"E2" displayed on thermostat
"--" displayed on thermostat
"Clean Filter" is displayed on thermostat
"E3" displayed on thermostat
"E7" displayed on thermostat
Cooling will not energize
Heating will not energize
LEGEND
LCD — Liquid Crystal Display
NOTE: Unoccupied Override may be entered by shorting the remote
room sensor for 3 to 10 seconds.
Copyright 1999 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 PC 111
Tab 11a 13a
Table 4 — Thermostat Output Assignments
COOLING COOLING
STAGE 1 STAGE 2
Y1/W2 Y1/W2, Y/Y2
Y1/W2, Y/Y2,
O/W2

TROUBLESHOOTING

Check for 24 vac between R and C at terminal connections. Both R and C must be
connected for proper thermostat operation.
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 acceptable power levels
are restored.
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 the
thermostat
After the configured number of blower operating hours, the Clean Filter message will
be displayed. This reminds the owner to replace the filter. Press the Reset Filter but-
ton to reset the blower operation timer to 0 hours.
If the outdoor thermostat is in error, not connected, or shorted, "E3" will be displayed.
Check outdoor thermostat wiring and replace if necessary.
L signal is present, locking out compressor operation.
Select COOL mode. Decrease cooling set point to 10 degrees below room tempera-
ture. Simultaneously press Fan and Up buttons to disable timers. Check for 24 vac at
Y/Y2 terminal. If present, thermostat is operating correctly and problem is with wiring
or equipment. If 24 vac is not present, replace the thermostat.
Select HEAT mode. Increase heating set point to 10 degrees above room tempera-
ture. 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.
Catalog No. 533-354 Printed in U.S.A.
The Smart Recovery Function operates any time the next
The
programmed heating set point is more than 2 degrees above the
current heating set point.
Smart Recovery will not occur if Hold is active. Smart Re-
covery will also be cancelled if the heating set point or time of
day are changed.
HEATING HEATING
STAGE 1 STAGE 2
W/W1 W/W1, 0/W2
Y1/W2 Y1/W2, Y/Y2
NOTES:
1. Heating stage 3 is only for heat pump applications.
2. All relays except where noted are N/O, dry contacts.
Form 33CS-36SI
HEATING
STAGE 3
N/A
W/W1,
Y1/W2, Y/Y2
SOLUTION
Pg 12 302 7-99 Replaces: 33CS-8SI
EMERGENCY
HEAT
0/W2
W/W1