TXU Energy iThermostat In-Home User Manual
Troubleshooting Assistance Guide
28
Temporary hold disappears from the screen and allows the
temperature to revert to the normal settings.
Normal operation. A temporary temperature hold setpoint remains in effect until the next
program time period begins. If a more permanent hold is desired, press the
HOLD
button.
Equipment
Fan will not turn Off.
•
The iThermostat fan setting may be in the On position. In this position, the fan will
continuously run. Change it to the Auto position.
•
iThermostat may be currently calling for heat or cool. This is normal operation. Fan
will turn off automatically once the heating/cooling is satisfied if the fan is in Auto
mode.
•
If the fan is in Auto mode and heating and cooling system is not operating, and the
fan will not turn off, the air handler fan relay switch is likely bad. Call your HVAC
contractor.
•
This may be the result of a ‘Power Stealing’ issue usually caused when an
iThermostat is not installed with a 5th or common wire. Contact your HVAC
technician to add a common wire or call iThermostat customer service at 1-866-733-
1807.
•
Heating/Cooling equipment has an internal fan overrun where the fan continues to
run after the heating or cooling unit turns off. Typical fan overrun times are 1-2
minutes following the heat or cool system shut down.
Fan will not turn On.
•
Make sure that the furnace power switch is turned on and that the iThermostat fan
switch is in correct position (see page 4).
•
Some heating and cooling equipment has a built-in time delay before the fan is
activated. It may take up to 90 seconds to activate.
•
Set the heating setpoint 5 degrees above the room temperature. Wait 5 minutes for
the fan to be activated.
•
If the fan does not activate, you may have blown a fuse or tripped a circuit breaker.
Heat will not come On.
•
Make sure system is set to heat mode. Press the
SYSTEM
button until the HEAT icon
is displayed.
•
Check whether a curtailment event is currently in progress by looking at the light
next to the up and down arrow buttons. If the light is On, then a curtailment event is
in progress and your heating system is temporarily disabled.
