TXU Energy iThermostat In-Home User Manual
Troubleshooting Assistance Guide
5
2
The light stays On, does not flash (Light next to UP/DOWN
buttons).
•
Normal operation. Indicates that a curtailment event is in effect or a test signal has
been sent.
•
If the light is On and the buttons will not change the display, your iThermostat may
need service. Call iThermostat customer service at 1-866-733-1807.
Display numbers/segments are fading out.
This may be the result of a ‘Power Stealing’ issue usually caused when an iThermostat is
not installed with a 5
th
or common wire. Contact iThermostat customer service at 1-866-
733-1807.
Programming
Temperature setting will not go lower or higher.
•
The upper or lower iThermostat temperature setting limits may have been reached.
The default lower limit is 45 and the default upper limit is 90. To change temperature
limits, see page 23.
•
Check to ensure that you are not in programming mode. Press the
RUN
button once
until the normal display appears. Try to change the temperature again.
Thermostat program has disappeared.
Ensure that someone else has not changed the program. If no one else has changed the
program, the schedule may have been lost. The iThermostat’s schedule is stored in a
non-volatile memory. The iThermostat may have sustained a large electrostatic
discharge, erasing its memory. In this case, the default setting will be displayed in the
programs.
Temperature changes at wrong time.
•
The iThermostat has an intelligent algorithm (Energy Recovery Management) that
automatically starts the heating/cooling system
before the scheduled start time so
that the desired temperature is reached at the scheduled start time. This feature can
be disabled from the Configuration Menu (see page 20).
•
The iThermostat may be set in the HOLD (override) mode. Press
RUN
to reset the
hold and go back to the programmed setpoint.
•
Recheck program for current settings versus the program settings.
•
Make sure the thermostat’s clock is set to the correct time (including AM/PM), Time
Zone, and date. See “Setting the Current Day and Time” on page 8.
•
Make sure AM and PM are correct for each period in the program.
