RT-SVX34V-EN
87
Troubleshooting
Table 40. Troubleshooting
Symptom
Probable Cause Recommended Action
A. Unit will not operate. No Heat, No Cool
or No Fan operation.
1. No power to the Unit. 1. Check line voltage at service disconnect.
2. No power to the Symbio™ 700.
2. See Symbio™ 700 Controller with Voyager 3 Packaged
Rooftop Air Conditioners (BAS-APG048*-EN) for Symbio
700 troubleshooting details.
3. Zone Sensor Module (ZSM) is defective or MODE circuit
is open. (VAV only)
3. See Zone Sensor Module (ZSM) Test Procedures or
short MODE input on VAV units.
4. Symbio™ 700 is defective.
4. See Symbio™ 700 Controller with Voyager 3 Packaged
Rooftop Air Conditioners (BAS-APG048*-EN) for Symbio
700 troubleshooting details.
5. Symbio 700 User Interface shows "Diagnostic: VFD
Supply Fan Broken Belt – 1".
5. Check the IDM and belts, replace as necessary.
6. Emergency Stop input is open. 6. Check the Emergency Stop input.
SZ VAV Units only
B. Unit will not Heat or Cool, but the Fan
switch operates.
1. Zone Sensor Module (ZSM) is defective.
1. Refer to the Zone Sensor Module (ZSM) Test
Procedures.
2. Problem in (ZSM) wiring.
2. Disconnect the ZSM wiring at RTRM and test the wires
using the Zone Sensor Test Procedures to locate any wiring
problems.
3. Symbio™ 700 is defective.
3. See Symbio™ 700 Controller with Voyager 3 Packaged
Rooftop Air Conditioners (BAS-APG048*-EN) for Symbio
700 troubleshooting details.
SZ VAV or VAV (Unoccupied)
C. Unit heats and cools, but will not control
to set point.
1. Zone Sensor Module (ZSM) is defective.
1. Refer to the Zone Sensor Module (ZSM) Test
Procedures.Refer to the Default Chart.
2. Thermometer on the ZSM out of calibration. 2. Check and calibrate the thermometer.
D. CPRs will not operate, ODMs will
operate.
1. Compressor failure.
1. Test compressor, mechanically and electrically. Replace
if necessary.
2. Wiring, terminal, or mechanical contactor failure.
2. Check wires, terminals, and compressor contactors.
Repair or replace if necessary.
3. LPC1 has tripped.
3. Leak check, repair, evacuate and recharge as necessary.
Check LPC1 operation.
4. Symbio™ 700 or Adapter Board is defective.
4. Check output voltage to compressor contactors on
Adapter Board J5.
E. CPRs operates, ODMs will not operate.
1. ODM has failed.
1. Check ODM's, replace if necessary.
2. Wiring, terminal, or mechanical contactor failure.
2. Check wires, terminals, and compressor contactor.
Repair or replace if necessary.
3. ODF 20 or 34 relay has failed.
3. Check for proper voltage and contact closure. ODF20
and 34 have a 24 VAC holding Coil. If voltage is present,
replace relay.
4. Symbio™ 700 or Adapter Board is defective.
4. See Symbio™ 700 Controller with Voyager 3 Packaged
Rooftop Air Conditioners (BAS-APG048*-EN) for Symbio
700 troubleshooting details.
F. CPRs and ODMs will not operate.
1. No power to compressor contactor coil. Possible Cool
Failure
1. Check wiring, terminals and applicable controls (HPCs,
DTLs, LPC)
2. Compressor contactor coil defective. Cool Failure
Indicated.
2. Check compressor contactor coil. If open or shorted,
replace compressor contactor.
3. Compressor contactor contacts defective.
3. If 24 VAC is present at compressor contactor coil, verify
contact closure.
4. Symbio™ 700 or Adapter Board is defective.
4. See Symbio™ 700 Controller with Voyager 3 Packaged
Rooftop Air Conditioners (BAS-APG048*-EN) for Symbio
700 troubleshooting details.
5. LPC1 has tripped
5. Leak check, repair, evacuate, and recharge as
necessary. Check LPCs operation.
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