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T8601D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS

9

69-1626

Table 6. Troubleshooting Guide.

Symptom

Possible Cause

Action

Display does not 
come on.

Thermostat is not being 
powered

Check that C terminal is connected to the system transformer.

Check for 24 Vac between R and C terminals.

—If missing 24 Vac:

check if the circuit breaker is tripped—reset the circuit 

breaker.

check if the system fuse is blown—replace the fuse. 

check if the power switch on the HVAC equipment is in 
the Off position—set to the On position.

check wiring between thermostat and HVAC equipment—
replace any broken wires and tighten any loose connec-

tions.

—If 24 Vac is present, proceed with troubleshooting.

Temperature 
display is 

incorrect.

Room temperature display 
has been reconfigured.

Enter Installer Setup number 37 and reconfigure the display.

Thermostat is configured 
for °F or °C display.

Enter Installer Setup number 14 and reconfigure the display.

Bad thermostat location.

Relocate the thermostat.

Temperature 

settings do not 
change. 

(Example: Cannot 
set the heating 

higher or the 
cooling lower.)

The upper or lower 

temperature limits were 
reached. 

Check the temperature setpoints:

Heating limits are 40 to 90°F (4.5 to 32°C)

Cooling limits are 48 to 99°F (7 to 35°C

The setpoint temperature 
range stops were 

configured.

Check Installer Setup numbers 34 and 35 and reconfigure the 
setpoint stops.

Heating does 
come on.

No power to the 
thermostat.

Check that C terminal is connected to the system transformer.

Check for 24 Vac between R and W terminals.

—If missing 24 Vac:

check if the circuit breaker is tripped—reset the circuit 

breaker.

check if the system fuse is blown—replace the fuse.

check if the power switch on the HVAC equipment is in 
the Off position—set to the On position.

check wiring between thermostat and HVAC equipment—

replace any broken wires and tighten any loose connec-
tions.

—If 24 Vac is present, proceed with troubleshooting.

Thermostat minimum off 

time is activated.

Wait up to five minutes for the system to respond.

System selection is not set 

to Heat.

Set system selection to Heat.

Heating setpoint is below 

room temperature.

Check heating setpoint. Set heating setpoint to desired temperature.

Cooling does not 

come on.

No power to the 

thermostat.

Check that C terminal is connected to the system transformer.

Check for 24 Vac between R and W terminals.
—If missing 24 Vac:

check if the circuit breaker is tripped—reset the circuit 
breaker.

check if the system fuse is blown—replace the fuse.

check if the power switch on the HVAC equipment is in 

the Off position—set to the On position.

check wiring between thermostat and HVAC equipment—

replace any broken wires and tighten any loose connec-
tions.

—If 24 Vac is present, proceed with troubleshooting.

Thermostat minimum off 

time is activated.

Wait up to five minutes for the system to respond.

Enter Installer Setup number 33. Reconfigure minimum off time (if 
required).

System selection is not set 
to Cool.

Set system selection to Cool.

Cool setpoint is above 
room temperature.

Check cooling setpoint. Set cooling setpoint to desired temperature.

Summary of Contents for T8601D

Page 1: ...ully Failure to follow the instructions can damage the product or cause a hazardous condition 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After completing installation use these instructions to check out the product operation Location Install the thermostat ...

Page 2: ...illed holes until flush with the wall 4 Position the wallplate over the holes pulling wires through the wiring opening 5 Loosely insert the mounting screws into the holes 6 Tighten mounting screws WIRING All wiring must comply with local electrical codes and ordinances Refer to Fig 3 through 5 for typical hookups A letter code is located near each terminal for identification CAUTION Electrical Haz...

Page 3: ...0353 FAN RELAY Y G THERMOSTAT C HEAT RELAY R W COMPRESSOR CONTACTOR TRANSFORMER B HEAT DAMPER COOL DAMPER O 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED CAN BE USED FOR CHANGEOVER VALVE ON SINGLE STAGE HEAT PUMP SYSTEMS AVAILABLE ON SELECT MODELS OT WIRES MUST HAVE A SEPARATE CABLE FROM THE THERMOSTAT CABLE 2 2 2 1 3 OT OT OUTDOOR TEMPERATURE SENSOR 3 L1 HOT L2 M1035...

Page 4: ...ngeover and outdoor temperature display Installer Setup numbers are listed in Table 3 The table includes all the configuration options and the factory settings for the T8601 A combination of key presses are required to use the Installer Setup feature To enter the Installer Setup press and hold the Information i key with the increase and decrease keys until the first number is displayed All display...

Page 5: ...orary Setting Em Ht M14618 INSTALLER SETUP NUMBER DISPLAY COLUMN 2 OF TABLE 3 FACTORY SETTING OR OTHER CHOICE DISPLAY COLUMN 3 OR 5 OF TABLE 3 Table 3 Thermostat Installer Setup Options Select Installer Setup Number Press Time key to change Factory Setting Other Choices Press or key to change Actual Setting Display Description Display Description Not used 1 Fan operationa 2 0 Conventional applicat...

Page 6: ...ssor 33 5 5 minute minimum off time for the compressor 0 thru 4 Minimum number of minutes 0 thru 5 the compressor is off between calls for the compressor Temperature range stops in heating 34 90 Highest setpoint heating can be set to 40 to 89 Temperature range 1 F increments heating setpoint can be set to Temperature range stops in cooling 35 45 Lowest setpoint cooling can be set to 46 to 99 Tempe...

Page 7: ... test Press Run Program to exit the self test M14619 Time Set Program System Fan Run Program Hold Temp Set Current Day Time Set Current Day Time Wake Leave Return Sleep Day Heat Cool Settings Daylight Time Copy Set Day Time Mon PM M14620 Time Set Program System Fan Run Program Hold Temp Set Current Day Time Wake Leave Return Sleep Day Day Heat Cool Settings Daylight Time Copy Set Day Time PM Tue M...

Page 8: ...Example 001 Revision number 1 5 Press the increase key again to display the EEPROM identification code Example 314 EEPROM ID 314 6 Press the Run Program key to exit the self test The self test times out after four minutes without any key presses CHECKOUT Outdoor Temperature Sensor select models Allow the outdoor temperature sensor to soak in the outdoor air for a minimum of five minutes before tak...

Page 9: ...al is connected to the system transformer Check for 24 Vac between R and W terminals If missing 24 Vac check if the circuit breaker is tripped reset the circuit breaker check if the system fuse is blown replace the fuse check if the power switch on the HVAC equipment is in the Off position set to the On position check wiring between thermostat and HVAC equipment replace any broken wires and tighte...

Page 10: ...entional heating equipment turns on the fan when the furnace has warmed up to a setpoint Wait a minute after seeing the on indicator and then check the registers Heating or cooling equipment is not operating Verify operation of heating or cooling equipment in self test Outdoor temperature not displayed a Option not activated Enter Installer Setup number 24 and set to 1 Thermostat must have OT term...

Page 11: ...T8601D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS 11 69 1626 ...

Page 12: ...m yourhome Printed in U S A on recycled paper containing at least 10 post consumer paper fibers XWRPDWLRQ DQG RQWURO 6ROXWLRQV RQH ZHOO RQH ZHOO LPLWHG RQH ZHOO LPLWpH RXJODV ULYH 1RUWK QDPLF ULYH ROGHQ 9DOOH 01 6FDUERURXJK 2QWDULR 0 9 ...

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