Troubleshooting - Honeywell T8635L User Manual

TROUBLESHOOTING

Symptom
Display does not come
on.
Temperature setting does
not change (Example:
cannot set the heating
higher or the cooling
lower).
Heating does not come
on.
Possible Cause
Thermostat is not being powered.
The upper or lower temperature
limits were reached.
No power to the thermostat.
System selection is not set to Heat.
Heating setpoint is below room
temperature.
Check if the thermostat is mounted and latched on the wallplate—
mount and latch the thermostat on the wallplate.
Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the fuse at the fuse box is blown—replace the fuse.
Check if the system switch at the equipment is in the Off
position—set to the On position.
Check that the temperature setpoints are:
Heating: 40 to 90°F (4 to 32°C)
Cooling: 55 to 99°F (13 to 37°C).
Check that setpoint is above room temperature.
Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the fuse at your fuse box is blown—replace the fuse.
Check if the System switch at the equipment is in the Off
position—set to the On position.
Wait five minutes for the system to respond (thermostat displays
" Wait").
Set System selection to Heat.
42
Action
69-1332—3
continued