Venstar thermostat troubleshooting

Venstar T3900 thermostat troubleshooting

SYMPTOM:CAUSE:REMEDY:
The air conditioning does not attempt to turn onThe compressor timer lockout may prevent the air conditioner from turning on for a period of timeConsult the Owner's Manual in the Installer Setup section to defeat the Cycles Per Hour
The display is blankLack of proper powerMake sure the power is on to the furnace and that you have 24vac between R & C
The heating does not attempt to turn onThe heating setpoint is set too lowRaise the heating setpoint or raise the heating set-point limit
The air conditioning does not attempt to turn onThe cooling setpoint is set too highLower the cooling setpoint or lower the cooling set-point limit
When controlling a residential heat pump, and asking for cooling, the heat comes onThe thermostat reversing valve jumper is set for "B"Set the reversing valve jumper for "0"
When calling for cooling, both the heat and cool come onThe thermostat equipment jumper is configured for "HP" and the HVAC unit is a Gas/ElectricSet the equipment jumper for "Gas"
When the Program button is pressed, the display reads "DISABLED"Program mode is set to "NON PROGRAM"Set Program Mode (Setup 1) to 1, 5/2, or 7 Day

Venstar INSTEON 2491T1E thermostat troubleshooting

ProblemPossible CauseSolution
Thermostat does not respond to Off commands.Did not “link to off’See Adding Thermostat as an INSTEON Responder and link to “Scene Off."
LED won’t come On.Difficulty viewing LEDTurn off room lights.
Hold a piece of white paper at a 45-degree angle up against wall just below the thermostat. This will act as a reflector making the LED must easier to see.
Thermostat won’t add to scene as a responder.The controller may have dropped out of linking mode or linked to another device.Try relinking thermostat to the controller.
The INSTEON signal may not be getting to the “vicinity” of thermostat.Make sure phases are bridged, Add additional INSTEON devices and/or move around existing INSTEON devices.
Large appliances, such as refrigerators or air conditioners, may be producing electrical noise on the powerline.Install a powerline noise filter (FilterLinc #1626-10) to filter electrical noise and minimize signal attenuation.
Other electrical devices, such as computers, televisions or power strips, may be absorbing the INSTEON signal.
Thermostat is taking a long time to respond to a controller.The controller may be sending commands to a responder that is no longer in use. Commands for the unused responder are being resent and loading down the signal.Unlink any unused responders from the controller. HINT: If you are using home automation software such as HouseLinc, you can easily check scene membership and eliminate unnecessary links.
If the above doesn’t work, perform a factory reset on the controller.
Thermostat changed “all by itself.”Another controller, a timer or stray X10 signals could have triggered thermostat.Monitor for recurrence and remove reason if you can determine what it is. If necessary perform a factory reset
Thermostat is locked up.Excessive RF noise on may have caused a lock-up.Remove power to thermostat (by removing LCD “panel” from the back panel connected to the wall), wait 10 seconds and replace.
Perform a factory reset. See Factory Reset.

Venstar COMMERCIAL T6800 ColorTouch thermostat troubleshooting

SYMPTOM:CAUSE:REMEDY:
The thermostat touchscreen buttons are not responsiveThe touchscreen is out of calibrationRemove the thermostat from the backplate. Push the thermostat back onto the backplate, while keeping your finger pressed firmly against the center of the touchscreen, until the Calibration screen appears. Re-calibrate theTouchscreen
The display is blankLack of proper powerMake sure the power is on to the HVAC and that you have 24vac between R & C
The air conditioning does not attempt to turn onThe cooling setpoint is set too highLower the cooling setpoint or lower the cooling set-point limit
The heating does not attempt to turn onThe heating setpoint is set too lowRaise the heating setpoint or raise the heating set-point limit
When controlling a residential heat pump, and asking for cooling, the heat comes onThe thermostat reversing valve dip switch is set for "B"Set the reversing valve jumper for "0"
When calling for cooling, both the heat and cool come onThe thermostat equipment dip switch is configured for "HP" and the HVAC unit is a Gas/ElectricSet the equipment dip switch for "Gas'!
Air handler control board fuse blows when thermostat is attached to backplate with power on, but does not blow until the thermostat is placed onto the backplateThe Outdoor sensor and/or sensor wiring is shortedCheck/replace Outdoor sensor and/or sensor wiring