Troubleshooting Guide - Honeywell T8611G Chronotherm IV Deluxe Manual

TROUBLESHOOTING GUIDE

Refer to Table 12 for troubleshooting information.
Symptom
Display will not come Thermostat is not being powered.
on.
Temperature display Room temperature display has
is incorrect. been reconfigured.
Thermostat is configured for °F or
°C display.
Bad thermostat location.
The upper or lower temperature
Temperature settings
limits were reached.
will not change.
(Example: Cannot set
the heating higher or
The setpoint temperature range
the cooling lower.)
stops were configured.
Heating will not come No power to the thermostat.
on.
Heating will not come Thermostat minimum off time is
on. activated.
System selection is not set to Heat. Set system selection to Heat.
Heating setpoint is below room
temperature.
Cooling will not come No power to the thermostat.
on.
T8611G CHRONOTHERM
Table 12. Troubleshooting Information.
Possible Cause
®
IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT
• 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 connections.
— If 24 Vac is present, proceed with troubleshooting.
Enter Installer Setup number 37 and reconfigure the display.
Enter Installer Setup number 14 and reconfigure the display.
Relocate the thermostat.
Check the temperature setpoints:
• Heating limits are 40 to 90°F (7 to 31°C)
• Cooling limits are 48 to 99°F (9 to 37°C)
Check Installer Setup numbers 34 and 35 and reconfigure the
setpoint stops.
• 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 connections.
— If 24 Vac is present, proceed with troubleshooting.
Wait up to five minutes for the system to respond.
Check heating setpoint. Set heating setpoint to desired
temperature.
• Check for 24 Vac between R and C.
— 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 connections.
— If 24 Vac is present, proceed with troubleshooting.
19
Action
(continued)
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