Troubleshooting - Trane XR401 Installer's Manual

Troubleshooting

Table 4
Symptom
Display will not come on.
Indoor temperature display is
incorrect.
Outdoor temperature display is
incorrect.
Outdoor temperature display
shows "--" and Service indicator
on solid.
Cannot set Heating setpoint
above 80 degrees
Service indicator Flashing on and
off.
Service indicator solid on and "--"
in temperature display.
Temperature setting will not
change. (Example: Cannot set
heating higher or cooling lower).
Room temperature overshoots
when Energy Savings Key ($) is
used or the Heat/Cool settings is
changed more than 2 degrees.
Heating will not come on.
Cooling will not come on.
Cool ON or Heat ON is displayed,
but no warm or cool air is coming
from the registers.
Control does not respond to
keypad presses.
Fan does not operate properly in
heat or cool mode.
Fan runs all the time.
Cooling cycle too fast or too slow.
(Narrow or wide temperature
swing).
Heating cycle too fast or too slow.
(Narrow or wide temperature
swing).
6
Troubleshooting
Possible Cause
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch OFF.
3. Furnace blower compartment door or panel
loose or not properly installed.
Temperature display needs calibration.
Temperature display needs calibration.
Outdoor temperature sensor open or shorted
Outdoor sensor field wiring open or shorted
Deadband between Heating and Cooling set to high
Control EEPROM write error.
Indoor temperature sensor open or shorted
1. Upper and/or lower temperature limits were
reached.
2. "Keypad locked" is displayed on LCD.
Oversized heating or cooling equipment. Control
can not respond fast enough to prevent
overshooting.
1. System Mode not set to Heat.
2. Minimum off time delay being enforced.
3. Loose connection to control or system.
4. Heating system requires service or
control requires replacement.
1. System Mode not set to Cool.
2. Minimum off time delay being enforced
3. Loose connection to control or system.
4. Cooling system requires service or
control requires replacement.
1. The heating equipment turns on the
fan when the furnace has warmed up to a
setpoint.
2. Heating or cooling equipment is not
operating.
1. "Keypad locked" is displayed on LCD.
2. Keypad failure.
1. Incorrect wiring.
2. Heating or cooling equipment inoperative.
1. Fan mode set to ON.
2. Shorted control wiring.
The location of the control and/or the size of the
cooling system may be influencing the cycle rate.
The location of the control and/or the size of the
heating system may be influencing the cycle rate.
Installer's Guide
Action
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.
Calibrate Sensor - User Setup Step 49.
1. Calibrate Sensor - User Setup Step 50.
2. Disconnect outdoor sensor from controls terminal block and check the
sensor and field wiring reisitance value - Table 2.
1. Replace outdoor sensor.
2. Check / repair outdoor sensor field wiring.
Decrease Deadband setting - User Setup Step 42.
Press any key and Check / Re-enter Setup Choices.
Replace Control
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.
Set Control Response rate to "Fast" - Step 33.
1. Set Mode to heat and raise the setpoint above room temperature.
2. If heating does not come on within 5 minutes, Check Heating.
3. Check - Repair connections.
4. Repair system / Replace control.
1. Set Mode to cool and lower the setpoint below room temperature.
2. If cooling does not come on within 15 minutes, contact servicer.
3. Repair connections.
4. Repair system / Replace control.
1. Wait one minute after Heat ON is displayed
and then check the registers.
2. Check Heating and Cooling system.
1. Unlock keypad - press Up+Down arrow together until "Keypad locked"
appears.
2. Replace Control.
1. Correct wiring.
2. Repair system.
1. Set fan mode to AUTO.
2. Check / Repair wiring.
Verify cycle rate adjustment Step 19.
Verify cycle rate adjustment Step 27.
Pub. No. 18-HD29D2-4