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Reset Filter Display --The thermostat will display "FILTER" on the LCD when it is time to change or clean the filtel: After cleaning or changing the filter, press the RESET FILTER button to restart the timer and turn off the indicator Auto Changeover Operation --The thermostat will provide automatic changeover from Heating to Cooling mode and Cooling to Heating mode when required. The thermostat will automatically switch to maintain the desired temperature setting. The thermostat does not need to be manually changed fi_)m heating to cooling or cooling to heating operation. Manufacturer reserves the right to REPLACEMENT COMPONENTS DIVISION LITERATURE NUMBER P274-7SO discontinue, or change at any time, ©CARRIER CORPORATION 2004 9-04 REPLACES: 997-510011-19 specifications or designs without notice and without Incurring obllgaUons. PRINTED IN U.S.A. CATALOG NO. 570-352 Battery Changeout-If the installation requires tile NOTE: If installation is hard-wired, batteries are not usage of batteries, the batteries will require replacement every required and will not need to be replaced. 12 months. Error Codes --If the thermostat displays "--", "E2", Open thermostat door and slide the battery compartment "E3", or "E4" in the LCD, an error is present. See Table 1 for door to the fight. Remove two AA alkaline batteries. Install enor codes and descriptions. two new AA alkaline batteries following the polarity markings (+ / -) on the thermostat. Table 1 --Error Codes SYMPTOM WHAT TO CHECK Blank LCD Check for 24 vac between R and C at terminal connections or battery. "--" (2 dashes) on temperature display Temperature sensor reading out of range. Check sensor for damage. If recycling power does not clear display, thermostat should be replaced. "E2" on temperature display Brownout condition or too low of voltage to thermostat. Double check wiring and check for 24 vac between R and C. E2 will clear 15 sec after proper voltage is restored. "E3" on temperature display The outdoor temperature sensor is open, not connected, or shorted. "SERVICE FILTER" on temperature display After the selected number of hour of blower operation "FILTER" will display on LCD. This is to remind the home owner to "check" the filter. Press RESET FILTER button to clear display and reset timer to 0. Cooling will not come on Select COOL mode. Set desired temperature to 10° F below room temperature. Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for COOL ON icon and 24 vac at Y (first-stage) terminal. If present, thermostat is okay and 3roblem is with equipment or wiring. If not present, replace thermostat. Heating will not come on Select HEAT mode. Set desired temperature to 10 ° F above room temperature. Simultaneously press FAN and INCREASE TEMPERATURE buttons to defeat timers. Check for HEAT ON and 24 vac at Y (first-stage) terminal (with heat pump) or W/W1 (with air condi tioner) terminal. If present, thermostat is okay and problem is with equipment or wiring. If not present, replace thermostat. Mode Button selectsbetween HEAT, COOL, AUTO, and OFF operation. HeM pump thermostat models also includean EMERGENCY HEAT mode. -Fan Button chooses between CONTINUOUS FAN Up and AUTO FAN operalion. Increase or decrease the -RESET FILTER Button desired temperature setting. restarts the timer that calculates the next air filter change or cleaning. LOW BATTERY Indicator_ will light when batteries (if installed) need to be replaced. Outdoor Temperature Display is an optional feature that shows the outdoor temperature on the LCD reado...

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