Instructions / Assembly

10
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic Comfort Interface operation, you can reset it by
removing batteries for 2 minutes. After resetting it, replace the
batteries and reset clock. If it still does not function correctly,
press
and and Fan button simultaneously. The Comfort
Interface should go blank and then all segments will be displayed
momentarily.
Note: 

settings and programming will reset back to factory settings.
Symptom Possible Cause Correction Action
Communication Failure

1. Loss of 24 volt power to Equipment
Control Module.
2. Comfort Interface & Equipment Module
are located too far apart.
3. Too much interference between devices.
1. Check 24 volt power at R-C on Equipment Control Module.
2. Relocate Comfort Interface closer to the Equipment Control Module.
3. Relocate Comfort Interface away from obstruction or closer to
Equipment Control Module.



Comfort Interface display setting requires
adjustment.
5
o
. See Temperature Display


Cycles Too Fast or Too Slow


The location of the Comfort Interface and/
or the size of the heating system may be

Digital Comfort Interfaces provide precise control and cycle faster

frequently but runs for a shorter time so there is no increase in energy
use. If you would like an increased cycle time, choose SL for slow cycle

 Cooling system requires service. Verify you are set to cool. Lower the setting below the room
temperature.
Check Easy Install module Y
Interface/Equipment Control Module is calling for cool. Check for
broken or shorted wire from Equipment Control Module to HVAC
Equipment. If LED is OFF or solid ON Comfort Interface not calling.
Check 24 volt power to C - Y, G from Equipment Control Module to
HVAC Equipment.
See fault code table for Comfort Alert Systems.


1. Furnace lock-out condition. Heat may also
be intermittent.
2. Heat pump system requires service.
3. Pilot light not lit.
1. Verify you are set to heat. Raise setpoint above the room
temperature.

Interface/module is calling for heat. Check for broken or shorted
wire from module to HVAC Equipment. If LED is  or solid ON
Comfort Interface not calling.
Check for 24 volt power to C- W/E, W2 from module to HVAC
Equipment.
2. Many furnaces have safety devices that shut down when a lock-
out condition occurs. If the heat works intermittently, contact the
furnace manufacturer or local HVAC service person for assistance.
See fault code table for Comfort Alert Systems.
3. Re-light pilot.

constantly
1. Possible short in wiring.
2. Possible short in Comfort Interface.
3. Possible short in heat/cool/fan system.
4. Fan Switch set to Fan ON.
Check each wire connection from module to HVAC Equipment to
verify they are not shorted or touching together.

Equipment Control Module is calling for heat, cool or fan. If heat or
cool runs with LED OFF solid ON check for shorted wire from module
to HVAC Equipment.
 Press
and hold the Menu button for a minimum of 15 seconds. The Comfort
Interface lock icon will be removed and Comfort Interface will return
to normal operation.
Note: For troubleshooting Wireless Remote Temperature Sensors, refer to Installation Instructions for F145RF-1600.