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