TXU Energy iThermostat In-Home User Manual
Troubleshooting Assistance Guide
9
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•
If the display on the thermostat is blank, verify that the air handler (emergency)
breaker is not tripped or manually turned off, and that the indoor air handler is being
powered. If the display is still blank, call iThermostat customer service at 1-866-733-
1807.
•
In HEAT mode, set the heat setpoint temperature to at least 4 degrees higher than
the current room temperature. Wait 5 or 6 minutes to get past the 5-minute
minimum safety delay period. If the STG 1 icon is displayed, and heat does not come
On, schedule an HVAC contractor service call. If the STG 1 icon is not displayed, call
iThermostat customer service at 1-866-733-1807.
•
For heat pumps, check and reset the breaker for heat pump compressor.
•
Make sure that the iThermostat RC/PS switch is in correct position. If you connected
a wire to the C terminal (24 VAC common), set the switch to RC. If you did not
connect a wire to the C terminal, set the switch to PS.
Temporary temperature hold, UP or DOWN buttons, will not
work.
The iThermostat may have been turned off. Press the
SYSTEM
button to place it in
cooling or heating mode, then retry.
Cooling will not come On.
•
Make sure system is set to COOL mode. Press the
SYSTEM
button until the COOL
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 air conditioning compressor is temporarily disabled.
•
If the display on the thermostat is blank, verify that the air handler (emergency)
breaker is not tripped or manually turned off, and that the indoor air handler is being
powered. Also verify that the outdoor compressor breaker is not tripped. For a gas
furnace, check for power to the outlet that provides 120v to the indoor fan at the
heater closet. If the outlet is powered and the thermostat display is still blank, call
customer service.
•
If air conditioner just shut off, or had a power interruption, wait 5 or 6 minutes until
the compressor safety “time-out” delay is passed.
•
In COOL mode, set the cool setpoint temperature to at least 4 degrees lower than
the current room temperature. Wait 5 or 6 minutes to get past the 5-minute
minimum safety delay period. If STG 1 icon is displayed and cool does not come On,
schedule an HVAC contractor service call. If STG 1 icon is not displayed, call
customer service.
•
Make sure that the iThermostat RC/PS switch is in correct position. If you connected
a wire to the C terminal (24 VAC common), set the switch to RC. If you did not
connect a wire to the C terminal, set the switch to PS.
