Table of Contents
Advertisement
No Cool
Possible Cause
System Switch not set to COOL.
Loose connection to thermostat or system.
Heating system requires service or
thermostat requires replacement.
Table 10-3 - No Cool
No Heat or No Cool
Possible Cause
Thermostat may be in Load Shed (a Control
Event is in progress).
Table 10-4 - No Heat or No Cool
Heat, Cool, or Fan Runs Constantly
Possible Cause
Fan set to ON.
Possible short in wiring, thermostat, or
HVAC system.
Table 10-5 - Heat, Cool, or Fan Runs Constantly
Blank Display and/or Keypad Not Responding
Possible Cause
Voltage spike or static discharge.
Table 10-6 - Blank Display and/or Keypad Not Responding
30 • Commercial Communicating Programmable Thermostat I&O Manual
Corrective Action
Press the SYSTEM button to select COOL and press
temperature setpoint below room temperature.
Verify thermostat and system wires are securely attached.
Diagnostic: Press the SYSTEM button to select COOL and press
lower the temperature setpoint below room temperature. Within a few
seconds the thermostat should make a soft click sound. This sound
usually indicates the thermostat is operating properly. If the thermostat
does not click, try the reset operation described on Section 10.1., Reset
Operation. If the thermostat does not click after being reset, contact your
HVAC contractor or place of purchase for a replacement. If the
thermostat clicks, contact the furnace manufacturer or HVAC contractor
to verify the heating is operating correctly.
Corrective Action
Wait for the Control Event to end.
Corrective Action
Change Fan to AUTO.
Check each wire connection to verify they are not shorted or touching
together. No bare wire should stick out from under terminal screws. Try
resetting the thermostat as described on Section 10.1., Reset Operation.
If the condition persists, the manufacturer of your system or HVAC
contractor can instruct you on how to test the HVAC system for correct
operation. If the system operates correctly, replace the thermostat.
Corrective Action
Use the Reset Operation described on Section 10.1., Reset Operation.
to lower the
026-1729 Rev 2 15-NOV-2016
to
Advertisement
Table of Contents
