Honeywell T8635L1013 Owner's Manual - Page 42

Troubleshooting

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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. Action 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). No power to the thermostat. System selection is not set to Heat. Heating setpoint is below room temperature. 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. continued 42 69-1332-4

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69-1332—4
TROUBLESHOOTING
continued
Symptom
Possible Cause
Action
Display does not come
on.
Thermostat is not being powered.
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.
Temperature setting
does not change
(Example: cannot set
the heating higher or the
cooling lower).
The upper or lower temperature
limits were reached.
Check that the temperature setpoints are:
Heating: 40 to 90°F (4 to 32°C)
Cooling: 55 to 99°F (13 to 37°C).
Heating does not come
on.
No power to the thermostat.
System selection is not set to
Heat. Heating setpoint is below
room temperature.
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.