Carrier 33CS Installation, Start-up, And Operating Instructions Manual

Also see for 33CS: Owner's manual Owner's manual Operating guide Installation, start-up, and operating instructions Owner's manual

Contents

Carrier 33CS Installation, Start-up, And Operating Instructions Manual Manual pdf 9 page image

9TROUBLESHOOTINGTable 4 — Thermostat TroubleshootingPROBLEM SOLUTIONDisplay on thermostat not illuminated. Check for 24 vac at the R terminal connection. Terminal R must beconnected for proper thermostat operation.‘‘Service Filter’’ is displayed on thermostat. After the configured number of blower operating hours, the Service Filtermessage will be displayed. This reminds the owner to replace the filter.Reset the Service Filter feature to reset the blower operation timer to 0hours.Cooling will not energize. Select COOL mode. Decrease cooling set point to 10 degrees below roomtemperature. Check for 24 vac at Y1 terminal with a load connected. Ifpresent, thermostat is operating correctly and problem is with wiring orequipment. If 24 vac is not present, replace the thermostat. Check for Com-pressor Cycle per Hour Limit. Cooling may be locked out.Heating will not energize. Select HEAT mode. Increase heating set point to 10 degrees above roomtemperature. Check for 24 vac at W1/O/B terminal with a load connected. Ifpresent, thermostat is operating correctly and problem is with wiring orequipment. If 24 vac is not present, replace the thermostat.When using 4 wires (R,G,W,Y), the cooling equipmenttries repeatedly to turn on, but cannot. At times thedisplay dims or disappears.There is not enough power available. Connect a 270 ohm, 10 watt powerresistor at the air-conditioning equipment between terminals W and C(non-heat pump applications only).When using 4 wires (R,G,W,Y), the heating equipmenttries repeatedly to turn on, but cannot. At times thedisplay dims or disappears.There is not enough power available. Connect a 270 ohm, 10 watt powerresistor at the air-conditioning equipment between terminals Y and C(non-heat pump applications only).When controlling a heat pump, heat comes on duringcooling cycle.Configure thermostat for heat pump operation (Table 2, Step 3).When calling for cooling, both heating and cooling areenergized.The thermostat is configured for a heat pump. Configure the thermostat fornon-heat pump operation (Table 2, Step 3).When controlling a commercial heat pump unit, unitruns in reverse or heating is always on.Commercial heat pumps require that Heat Pump Option on thermostat isturned OFF.The thermostat temperature display rises to 99 F. There is not enough voltage to the thermostat. Check wiring and powersupply.The resistor labeled “L3” on the thermostat is burnedout and brown. Thermostat will not work.The thermostat has been wired incorrectly and the circuit board is burnedout. Thermostat must be replaced.→1204

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