Owner's Manual
Page 2
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 match your new 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 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 match your new 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 heating/cooling system -
Owner's Manual
Page 4
Old thermostat Cover 69-2210EF-03 2 M28099 Leave wallplate in place Is there a sealed tube containing mercury? 2 Remove Old Thermostat Remove old thermostat but leave wallplate with wires attached. If so, see back cover for proper disposal instructions.
Old thermostat Cover 69-2210EF-03 2 M28099 Leave wallplate in place Is there a sealed tube containing mercury? 2 Remove Old Thermostat Remove old thermostat but leave wallplate with wires attached. If so, see back cover for proper disposal instructions.
Owner's Manual
Page 15
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. RTH6400 ASybsotuetmyosuertunpew thermostat Press and hold the s and FAN buttons until the screen changes (approximately 5 seconds).
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 ... without central air conditioning. (Use this setting if you could turn the fan on and off with a fan switch on your old thermostat.) Press to display next function. M28351 69-2210EF-03 14 TROUBLESHOOTING When correct setting is selected, press NEXT to change setting.
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 ... without central air conditioning. (Use this setting if you could turn the fan on and off with a fan switch on your old thermostat.) Press to display next function. M28351 69-2210EF-03 14 TROUBLESHOOTING When correct setting is selected, press NEXT to change setting.
Owner's Manual
Page 18
M28351 69-2210EF-03 16 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, ... 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). ASSISTANCE TROUBLESHOOTING Press to change setting.
M28351 69-2210EF-03 16 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, ... 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). ASSISTANCE TROUBLESHOOTING Press to change setting.
Owner's Manual
Page 23
Do not use . Wrap B wire with electrical tape. 21 69-2210EF-03 Connect O wire to both O and B if you have a heat pump. Wrap bare end of wire with electrical tape and do not match letters on the thermostat, check the chart below ). Do not connect both R and Rc terminals, remove metal jumper (see notes, below and connect to terminal as shown here (see page 6). RTH6400 Wiring If labels do not use C, X or B. SETUP WIRING ASSISTANCE TROUBLESHOOTING M28418 If wires will be connected to O/B W.
Do not use . Wrap B wire with electrical tape. 21 69-2210EF-03 Connect O wire to both O and B if you have a heat pump. Wrap bare end of wire with electrical tape and do not match letters on the thermostat, check the chart below ). Do not connect both R and Rc terminals, remove metal jumper (see notes, below and connect to terminal as shown here (see page 6). RTH6400 Wiring If labels do not use C, X or B. SETUP WIRING ASSISTANCE TROUBLESHOOTING M28418 If wires will be connected to O/B W.
Owner's Manual
Page 24
... Heat: 40° to 90°F (4.5° to 32°C). • Cool: 50° to 99°F (10° to 37°C). SETUP WIRING Advanced Installation Guide Troubleshooting If you have difficulty with your heating equipment (see page 16). Most problems can be corrected quickly and easily. Display is... set to match your 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).
... Heat: 40° to 90°F (4.5° to 32°C). • Cool: 50° to 99°F (10° to 37°C). SETUP WIRING Advanced Installation Guide Troubleshooting If you have difficulty with your heating equipment (see page 16). Most problems can be corrected quickly and easily. Display is... set to match your 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).
Owner's Manual
Page 26
same time (or • Grasp and pull thermostat away heat does not from wallplate. WIRING ASSISTANCE TROUBLESHOOTING 69-2210EF-03 24 SETUP Advanced Installation Guide Troubleshooting Heating • Check Function 1: System Type to and cooling equipment running in make sure ... your heating and cooling equipment (see page 14). Heating system• Check Function 1: System Type to is running at the make sure turn off) bare wires are not touching each other (see page 6). Check to match your cool mode heating and cooling equipment (see page 14).
same time (or • Grasp and pull thermostat away heat does not from wallplate. WIRING ASSISTANCE TROUBLESHOOTING 69-2210EF-03 24 SETUP Advanced Installation Guide Troubleshooting Heating • Check Function 1: System Type to and cooling equipment running in make sure ... your heating and cooling equipment (see page 14). Heating system• Check Function 1: System Type to is running at the make sure turn off) bare wires are not touching each other (see page 6). Check to match your cool mode heating and cooling equipment (see page 14).
Owner's Manual
Page 27
Accessories/replacement parts To order, please call Honeywell Customer Care toll-free at 1-800-468-1502. WIRING ASSISTANCE TROUBLESHOOTING 25 69-2210EF-03 To save time, please remove the battery holder and note your model number and date code... calling. Battery holder Part No. 50007072-001 Cover plate assembly Part No. 50002883-001 *Use to cover marks left by old thermostats. SETUP ACbuosutotmyoeur ransseiwsttahnecremostat RTH6400 For assistance with this product, please visit http://DIYthermostats.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.
Accessories/replacement parts To order, please call Honeywell Customer Care toll-free at 1-800-468-1502. WIRING ASSISTANCE TROUBLESHOOTING 25 69-2210EF-03 To save time, please remove the battery holder and note your model number and date code... calling. Battery holder Part No. 50007072-001 Cover plate assembly Part No. 50002883-001 *Use to cover marks left by old thermostats. SETUP ACbuosutotmyoeur ransseiwsttahnecremostat RTH6400 For assistance with this product, please visit http://DIYthermostats.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.