Troubleshooting - Prostat OEM Series User& Installer's Manual

7 Troubleshooting

• SYMPTOM: The thermostat touchscreen buttons are not responsive.
CAUSE: The touchscreen is out of calibration.
REMEDY: Remove 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 the touchscreen.
See Touch Calibration section of full user's manual (page 25).
• SYMPTOM: The display is blank.
CAUSE: Lack of proper power.
REMEDY: Make sure the power is on to the HVAC and that you have 24vac
between R & C.
• SYMPTOM: The air conditioning does not attempt to turn on.
CAUSE: The cooling setpoint is set too high.
REMEDY: Lower the cooling setpoint or lower the cooling set-point limit.
See Setpoint Limits (page 35).
• SYMPTOM: The heating does not attempt to turn on.
CAUSE: The heating setpoint is set too low.
REMEDY: Raise the heating setpoint or raise the heating set-point limit.
See Setpoint Limits (page 35).
• SYMPTOM: When controlling a residential heat pump, and asking for cooling,
the heat comes on.
CAUSE: The thermostat reversing valve dip switch is set for "B".
REMEDY: Set the reversing valve jumper for "O".
• SYMPTOM: When calling for cooling, both the heat and cool come on.
CAUSE: The thermostat equipment dip switch is configured for "HP" and the HVAC
unit is a Gas/Electric.
REMEDY: Set the equipment dip switch for "Gas".
• SYMPTOM: 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
backplate.
CAUSE: The Outdoor sensor and/or sensor wiring is shorted.
REMEDY: Check/replace Outdoor sensor and/or sensor wiring.
Manual & Installer Guide
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