Trane ReliaTel Diagnostic Manual page 82

Zone Sensor Module Testing
Table 30. Troubleshooting
Symptom
Display does not come on.
No communication with unit.
Sensor is communicating, but unit won't run
Displayed zone temperature is different from
actual temperature.
Zone temperature is not displayed
Displayed zone temperature reads "99".
Displayed zone temperature reads Sh and the
COOL FAIL icon is illuminated.
Displayed zone temperature reads oPand the
COOL FAIL icon is illuminated.
Programmable sensor will not respond to
keypad selections
Fan mode is set to on, but does not run during
unoccupied mode. Periods
Buzzer indicates System Failure, Check filter or
service is required.
sensor will not hold override changes.
COOL FAIL flashes and unit doesn't run. Check
for varying voltage on terminals.
COOL FAIL + HEAT FAIL icons flash
simultaneously
HEAT FAIL flashing
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Probable Cause and solution
Check for 24 vac on terminals 11 and 12 of the sensor.
Verify a varying voltage per step 2 of testing the sensor. If no
voltage is present, check with wiring to unit.
Check option 18 in Option Menu setup for correct baud rate.
Follow Option Menu setup in literature to calibrate the display.
Check option selection in Option menu setup
Space temperature is above or below the measurable range of
the sensor.
Verify that option 11 in Option Menu is set correctly. If correct,
check the wiring from the remote sensor at terminals S1 and
S2 for a shorted condition.
Verify that option 11 in Option Menu is set correctly. If correct,
check remote sensor wiring at terminals S1 and S2 for an open
circuit condition.
Check lower left corner of display for a padlock icon. If
displayed, press and hold the Time (+) and (-) key until the
icon goes away.
Check option 6 in Option menu setup for Auto selection during
unoccupied.
Press erase key to reset filter lapse timer. Buzzer will be reset
until noon of the next day if a system failure has not been
corrected.
Press the HOLDTEMP button within 20 seconds after changes
are made.
Sensor not communicating with unit. 11 and 12 at the unit. If
voltage is steady at approximately 30 vdc, check for open
circuit in wiring.
Check for defective outside air sensor. Emergency input is
open. (RTRM version 4.0)
Coil Temp Sensor fail (HP).
A heat failure has occurred. If HP unit, the unit may be in
emergency heat, or there is a defrost problem.
RT-SVD03G-EN