Owner's Manual
Page 2
It is Easy Label wires and remove your old thermostat Install and wire your new thermostat Set your new thermostat to match your heating/cooling system - Call 1-800-468-1502 for the most common system We are here to help. Installation is preset for wiring assistance before returning the thermostat to the store. 69-2210EF-03 ii
It is Easy Label wires and remove your old thermostat Install and wire your new thermostat Set your new thermostat to match your heating/cooling system - Call 1-800-468-1502 for the most common system We are here to help. Installation is preset for wiring assistance before returning the thermostat to the store. 69-2210EF-03 ii
Owner's Manual
Page 9
We are here to help. Have a Heat Pump system? See page 21. See page 14. 7 Connect Wires Simply match wire labels. M27513 Labels don't match? Call 1-800-468-1502 for wiring assistance. 7 69-2210EF-03 Remove metal jumper if you have both R and Rc wires.
We are here to help. Have a Heat Pump system? See page 21. See page 14. 7 Connect Wires Simply match wire labels. M27513 Labels don't match? Call 1-800-468-1502 for wiring assistance. 7 69-2210EF-03 Remove metal jumper if you have both R and Rc wires.
Owner's Manual
Page 10
8 Install Batteries Install two AA alkaline batteries. Back of thermostat M28346 69-2210EF-03 8
8 Install Batteries Install two AA alkaline batteries. Back of thermostat M28346 69-2210EF-03 8
Owner's Manual
Page 13
... system type is: q Single Stage Heat and Cool Congratulations, you have other questions, call us toll-free at 1-800-468-1502. This thermostat works on 24 volt or 750 mV systems. It will NOT work on page 13 to match your thermostat to your system type. *Heat Pump-an air conditioner that provides cooling in the summer, and also runs in reverse in the...
... system type is: q Single Stage Heat and Cool Congratulations, you have other questions, call us toll-free at 1-800-468-1502. This thermostat works on 24 volt or 750 mV systems. It will NOT work on page 13 to match your thermostat to your system type. *Heat Pump-an air conditioner that provides cooling in the summer, and also runs in reverse in the...
Owner's Manual
Page 14
Advanced Installation System setup 13 Wiring 21 Troubleshooting 22 Customer assistance 25 Limited warranty 26
Advanced Installation System setup 13 Wiring 21 Troubleshooting 22 Customer assistance 25 Limited warranty 26
Owner's Manual
Page 15
RTH6400 ASybsotuetmyosuertunpew thermostat Press and hold the s and FAN buttons until the screen changes (approximately 5 seconds). Function 1 Setting 0 Done Next Press DONE to next function. 13 69-2210EF-03 TROUBLESHOOTING M28349 Press NEXT to advance to exit and save settings. SETUP WIRING ASSISTANCE M28348 Press s or t to change settings.
RTH6400 ASybsotuetmyosuertunpew thermostat Press and hold the s and FAN buttons until the screen changes (approximately 5 seconds). Function 1 Setting 0 Done Next Press DONE to next function. 13 69-2210EF-03 TROUBLESHOOTING M28349 Press NEXT to advance to exit and save settings. SETUP WIRING ASSISTANCE M28348 Press s or t to change settings.
Owner's Manual
Page 16
SETUP Advanced Installation Guide Function 1: System type Press the s or t button to select the type of system you have in your home: 10 WIRING ASSISTANCE Done Next M28350 0 Heating & cooling: Gas, oil or electric heating with central air conditioning. 1 Heat pump: Outside compressor provides both heating and cooling. 2 Heating only: Gas, oil or electric heating without central air conditioning. 3 Heating only with fan: Gas, oil or electric heating without central air conditioning. (Use this setting if you could turn the fan on and off with...
SETUP Advanced Installation Guide Function 1: System type Press the s or t button to select the type of system you have in your home: 10 WIRING ASSISTANCE Done Next M28350 0 Heating & cooling: Gas, oil or electric heating with central air conditioning. 1 Heat pump: Outside compressor provides both heating and cooling. 2 Heating only: Gas, oil or electric heating without central air conditioning. 3 Heating only with fan: Gas, oil or electric heating without central air conditioning. (Use this setting if you could turn the fan on and off with...
Owner's Manual
Page 17
... page to continue. 20 Done Next M28352 0 Cooling changeover valve: Use this setting if you connected a wire labeled "O" to the O/B W wire terminal (see page 21). 1 Heating changeover valve: Use this setting if you connected a wire labeled "B" to the O/B W wire terminal (see page 21). ASSISTANCE TROUBLESHOOTING Press to change setting. SETUP WIRING RTH6400 Function 2: Heat pump changeover valve Press the s or t button to select whether your changeover valve is selected, press NEXT to display next function.
... page to continue. 20 Done Next M28352 0 Cooling changeover valve: Use this setting if you connected a wire labeled "O" to the O/B W wire terminal (see page 21). 1 Heating changeover valve: Use this setting if you connected a wire labeled "B" to the O/B W wire terminal (see page 21). ASSISTANCE TROUBLESHOOTING Press to change setting. SETUP WIRING RTH6400 Function 2: Heat pump changeover valve Press the s or t button to select whether your changeover valve is selected, press NEXT to display next function.
Owner's Manual
Page 18
... correct setting is selected, press NEXT to continue. 30 Done Next M28353 0 Gas or oil heat: Use this setting if you have a gas or oil heating system (system controls fan operation). 1 Electric heat: Use this setting if you have an electric heating system (thermostat controls fan operation). SETUP WIRING Advanced Installation Guide Function 3: Heating fan control Press the s or t button to select your heating system and fan operation: NOTE: If Function 3 does not appear, please turn to the next page to display next function. ASSISTANCE TROUBLESHOOTING Press to change setting.
... correct setting is selected, press NEXT to continue. 30 Done Next M28353 0 Gas or oil heat: Use this setting if you have a gas or oil heating system (system controls fan operation). 1 Electric heat: Use this setting if you have an electric heating system (thermostat controls fan operation). SETUP WIRING Advanced Installation Guide Function 3: Heating fan control Press the s or t button to select your heating system and fan operation: NOTE: If Function 3 does not appear, please turn to the next page to display next function. ASSISTANCE TROUBLESHOOTING Press to change setting.
Owner's Manual
Page 19
... gravity heat system. Press to display next function. SETUP RTH6400 Function 5: Heating cycle rate Press the s or t button to select your heating system and optimize its operation: NOTE: If Function 5 does not appear, please turn to the next page to continue. 55 WIRING ASSISTANCE Done Next M28354 5 Gas or oil furnace: Use this setting if you have a standard gas or oil furnace that is selected, press NEXT to change setting. M28351...
... gravity heat system. Press to display next function. SETUP RTH6400 Function 5: Heating cycle rate Press the s or t button to select your heating system and optimize its operation: NOTE: If Function 5 does not appear, please turn to the next page to continue. 55 WIRING ASSISTANCE Done Next M28354 5 Gas or oil furnace: Use this setting if you have a standard gas or oil furnace that is selected, press NEXT to change setting. M28351...
Owner's Manual
Page 20
... cool settings. TROUBLESHOOTING Press to display next function. M28351 69-2210EF-03 18 When correct setting is selected, press NEXT to change setting. SETUP Advanced Installation Guide Function 12: Manual/Auto Changeover Press the s or t button to option 0 if the outside temperature drops below 50ºF (10ºC). CAUTION: To avoid possible compressor damage, set to select Manual or Auto Changeover: 12 0 WIRING ASSISTANCE Done Next M28355 0 Manual Changeover: (Heat/Off/Cool) 1 Automatic Changeover: (Heat/Off/Cool/Auto...
... cool settings. TROUBLESHOOTING Press to display next function. M28351 69-2210EF-03 18 When correct setting is selected, press NEXT to change setting. SETUP Advanced Installation Guide Function 12: Manual/Auto Changeover Press the s or t button to option 0 if the outside temperature drops below 50ºF (10ºC). CAUTION: To avoid possible compressor damage, set to select Manual or Auto Changeover: 12 0 WIRING ASSISTANCE Done Next M28355 0 Manual Changeover: (Heat/Off/Cool) 1 Automatic Changeover: (Heat/Off/Cool/Auto...
Owner's Manual
Page 21
M28351 ASSISTANCE TROUBLESHOOTING 19 69-2210EF-03 SETUP WIRING RTH6400 Function 13: Smart Response® Technology Press the s or t button to display next function. When correct setting is selected, press NEXT to select Smart Response® Technology: 13 1 Done Next M28356 1 Smart Response® Technology ON 0 Smart Response® Technology OFF NOTE: See Operating Manual for information on Smart Response® Technology. Press to change setting.
M28351 ASSISTANCE TROUBLESHOOTING 19 69-2210EF-03 SETUP WIRING RTH6400 Function 13: Smart Response® Technology Press the s or t button to display next function. When correct setting is selected, press NEXT to select Smart Response® Technology: 13 1 Done Next M28356 1 Smart Response® Technology ON 0 Smart Response® Technology OFF NOTE: See Operating Manual for information on Smart Response® Technology. Press to change setting.
Owner's Manual
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SETUP WIRING Advanced Installation Guide AFubnocuttioynou1r4n: eTwemthpermatousrteadt isplay Press the s or t button to select Fahrenheit or Celsius temperature display: 14 0 Done Next 0 Fahrenheit temperature display (°F) 1 Celsius temperature display (°C) M28357 Press to exit and save changes. When correct setting is selected, press DONE to change setting. M28351 ASSISTANCE TROUBLESHOOTING 69-2210EF-03 20
SETUP WIRING Advanced Installation Guide AFubnocuttioynou1r4n: eTwemthpermatousrteadt isplay Press the s or t button to select Fahrenheit or Celsius temperature display: 14 0 Done Next 0 Fahrenheit temperature display (°F) 1 Celsius temperature display (°C) M28357 Press to exit and save changes. When correct setting is selected, press DONE to change setting. M28351 ASSISTANCE TROUBLESHOOTING 69-2210EF-03 20
Owner's Manual
Page 23
RTH6400 Wiring If labels do not use C, X or B. Connect O wire to terminal as shown here (see page 6). Do not use . Wrap B wire with electrical tape. 21 69-2210EF-03 SETUP WIRING ASSISTANCE TROUBLESHOOTING M28418 If wires will be connected to both O and B if you have a heat pump. Do not connect both R and Rc terminals, remove metal jumper (see notes, below and connect to O/B W. Wrap bare end of wire with electrical tape and do not match letters on the thermostat, check the chart below ).
RTH6400 Wiring If labels do not use C, X or B. Connect O wire to terminal as shown here (see page 6). Do not use . Wrap B wire with electrical tape. 21 69-2210EF-03 SETUP WIRING ASSISTANCE TROUBLESHOOTING M28418 If wires will be connected to both O and B if you have a heat pump. Do not connect both R and Rc terminals, remove metal jumper (see notes, below and connect to O/B W. Wrap bare end of wire with electrical tape and do not match letters on the thermostat, check the chart below ).
Owner's Manual
Page 24
... batteries are set to match your heating equipment (see page 16). Display is set to acceptable change • Check Function 1: System Type to system setting make sure it is set to match your thermostat, please try the following suggestions. Temperature Make sure heating and cooling settings do not temperatures are correctly installed (see page 7). ASSISTANCE TROUBLESHOOTING 69-2210EF-03 22 Most problems can be corrected quickly and easily. SETUP WIRING Advanced Installation Guide Troubleshooting...
... batteries are set to match your heating equipment (see page 16). Display is set to acceptable change • Check Function 1: System Type to system setting make sure it is set to match your thermostat, please try the following suggestions. Temperature Make sure heating and cooling settings do not temperatures are correctly installed (see page 7). ASSISTANCE TROUBLESHOOTING 69-2210EF-03 22 Most problems can be corrected quickly and easily. SETUP WIRING Advanced Installation Guide Troubleshooting...
Owner's Manual
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... Cool. cool mode ASSISTANCE TROUBLESHOOTING 23 69-2210EF-03 Wait 5 minutes for the system to respond. Heat pump • Check Function 2: Heat Pump issues cool air Changeover Valve to make sure in system (see page 15). SETUP WIRING Troubleshooting RTH6400 Heating or • Press SYSTEM button to set higher than the Inside temperature. • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on. • Make sure furnace...
... Cool. cool mode ASSISTANCE TROUBLESHOOTING 23 69-2210EF-03 Wait 5 minutes for the system to respond. Heat pump • Check Function 2: Heat Pump issues cool air Changeover Valve to make sure in system (see page 15). SETUP WIRING Troubleshooting RTH6400 Heating or • Press SYSTEM button to set higher than the Inside temperature. • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on. • Make sure furnace...
Owner's Manual
Page 26
... time (or • Grasp and pull thermostat away heat does not from wallplate. Heating system• Check Function 1: System Type to is running at the make sure it is set to make sure it is set to match your cool mode heating and cooling equipment (see page 14). WIRING ASSISTANCE TROUBLESHOOTING 69-2210EF-03 24 Check to match your heating and cooling equipment (see page 14). SETUP Advanced Installation Guide Troubleshooting Heating...
... time (or • Grasp and pull thermostat away heat does not from wallplate. Heating system• Check Function 1: System Type to is running at the make sure it is set to make sure it is set to match your cool mode heating and cooling equipment (see page 14). WIRING ASSISTANCE TROUBLESHOOTING 69-2210EF-03 24 Check to match your heating and cooling equipment (see page 14). SETUP Advanced Installation Guide Troubleshooting Heating...
Owner's Manual
Page 27
... time, please remove the battery holder and note your model number and date code before calling. Battery holder Part No. 50007072-001 Cover plate assembly Part No. 50002883-001 *Use to cover marks left by old thermostats. Accessories/replacement parts To order, please call Honeywell Customer Care toll-free at 1-800-468-1502. WIRING ASSISTANCE TROUBLESHOOTING 25 69-2210EF-03 SETUP ACbuosutotmyoeur ransseiwsttahnecremostat RTH6400 For assistance with this product, please visit http://DIYthermostats.honeywell...
... time, please remove the battery holder and note your model number and date code before calling. Battery holder Part No. 50007072-001 Cover plate assembly Part No. 50002883-001 *Use to cover marks left by old thermostats. Accessories/replacement parts To order, please call Honeywell Customer Care toll-free at 1-800-468-1502. WIRING ASSISTANCE TROUBLESHOOTING 25 69-2210EF-03 SETUP ACbuosutotmyoeur ransseiwsttahnecremostat RTH6400 For assistance with this product, please visit http://DIYthermostats.honeywell...
Owner's Manual
Page 28
... Dr, Golden Valley, MN 55422 or call Honeywell Customer Care at any time during the warranty period the product is shown by Honeywell that the defect or malfunction was caused by the consumer. 1-year limited warranty Honeywell warrants this product, excluding battery, to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell's option). THE DURATION OF ANY IMPLIED...
... Dr, Golden Valley, MN 55422 or call Honeywell Customer Care at any time during the warranty period the product is shown by Honeywell that the defect or malfunction was caused by the consumer. 1-year limited warranty Honeywell warrants this product, excluding battery, to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell's option). THE DURATION OF ANY IMPLIED...
Owner's Manual
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... M1V 4Z9 http://DIYthermostats.honeywell.com Printed in a sealed tube. D542,677 and other patents pending. © 2008 Honeywell International Inc. 69-2210EF-03 M.S. Registered Trademark. US Patent No. Contact your old thermostat in the trash if it contains mercury in U.S.A. CAUTION: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50...
... M1V 4Z9 http://DIYthermostats.honeywell.com Printed in a sealed tube. D542,677 and other patents pending. © 2008 Honeywell International Inc. 69-2210EF-03 M.S. Registered Trademark. US Patent No. Contact your old thermostat in the trash if it contains mercury in U.S.A. CAUTION: To avoid possible compressor damage, do not run air conditioner if the outside temperature drops below 50...