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Pub. No. 22-5206-01
UP / DOWN Arrow
- Use these keys to raise or lower the Heat or Cool Setting.
- The first key press turns on the back lighting and a border around the setting to be
adjusted without changing the setting.
- Pressing the Up or Down arrow again will raise or
lower the setting that has the border around it.
- If you press and hold the Up or Down arrow, the temperature setting will advance
rapidly.
- When the control is set to Auto mode, pressing the Mode key once changes the position
of the border to heat or cool.
Trouble
-shooting
Page - 20
Pub. No. 22-5206-01
Table 2
Troubleshooting
Symptom Possible Cause Action
Display will not come on.
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch OFF.
3. Furnace blower compartment door or panel
loose or not properly installed.
1. Replace fuse or reset breaker.
2. Turn switch to ON.
3. Replace door panel in proper position to engage safety interlock or
door switch.
Temperature display is incorrect. Temperature display needs calibration. Calibrate Sensor - User Setup Step 49.
Outdoor temperature display is
incorrect.
Temperature display needs calibration.
Outdoor sensor located in poor sensing location.
1. Calibrate Sensor - User Setup Step 50.
2. Disconnect sensor and check circuit resistance value - Table 4.
3. Relocate outdoor sensor.
Cannot set Heating setpoint
above 80 degrees
Deadband between Heating and Cooling set to high Decrease Deadband setting - User Setup Step 42.
"Service" Flashing on and off. Control EEPROM write error. Press any key and Check / Re-enter Setup Choices.
"Service" solid on and "--" in
temperature display.
Indoor temperature sensor open or shorted Replace Control
Outdoor temperature display
shows "--" and Service indicator
on solid.
Outdoor temperature sensor open or shorted
1. Check outdoor sensor wiring.
2. Replace outdoor sensor.
Temperature setting will not
change. (Example: Cannot set
heating higher or cooling lower).
1. Upper and/or lower temperature limits were
reached.
2. "Keypad locked" is displayed on LCD.
1. Check the temperature setpoints:
Heating limits are 40 - 85F.
Cooling limits are 65 - 90F.
2. Unlock keypad - press Up+Down arrow together until icon disappears.