Honeywell YRTH7500D1009 Operation Manual - Page 23
About your new thermostat, In case of difficulty - security
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AInbcoausteyouf rdinffeicwutlhtyermostat RTH7400/RTH7500 Series If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected quickly and easily. Display is blank • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on. • Make sure furnace door is closed securely. • If thermostat is battery powered, make sure fresh AA alkaline batteries are correctly installed (see page 19). No response to key presses (or temperature will not change) Make sure heating and cooling temperatures are set to acceptable ranges: • Heat: 40° to 90°F (4.5° to 32°C). • Cool: 50° to 99°F (10° to 37°C). Note: Select models have temperature range setting limits that can limit the ranges listed above. See Installation Instructions for more information. 21 69-2744ES-01