88
RT-SVX34V-EN
Table 40. Troubleshooting (continued)
Symptom
Probable Cause Recommended Action
G. ODM 3 and/or 4 will not cycle.
1. OAS has failed.
1. Perform OAS Resistance/Temperature check. Replace if
necessary.
2. Wiring, terminal, or OFC3 contactor failure.
2. Check wires, terminals, and OFC3. Repair or replace if
necessary.
3. ODM3 and/or 4 has failed.
3. Check ODM, replace if necessary.
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. ODF20 has failed.
5. Check for proper voltage and contact closure. ODF20
relay has a 24 VAC holding coil. If voltage is present,
replace relay.
H. Indoor motor (IDM) will not operate
1. IDM has failed.
1. Check IDM, replace if necessary.
2. Wiring, terminal, fuses, or contactor failure.
2. Check wiring, terminals, fuses, and contactor assembly.
Repair or replace wiring, terminals, fuses or fan contactor
assembly.
3. ZSM is defective.
3. Place unit in test mode. If the fan operates in the test
mode, test the ZSM using the appropriate test procedures.
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. Supply fan proving diagnostic has been enunciated.
5. Check Symbio™ 700 user interface and VFD for Broken
Belt diagnostics. Replace belt if necessary.
I. No Heat (YC’s only) CFM will not run,
igniter sparks, GV is energized
1. CFM has failed.
1. Check CFM, replace if necessary.
2. CFM capacitor has failed.
2. Disconnect BROWN wires from capacitor, test, and
replace if necessary.
3. Wiring, or terminal failure.
3. Check wiring, and terminals. Repair, or replace if
necessary.
4. TNS3 and/or 4 has failed. (460/575 V units only)
4. Check for 230 VAC at TNS3 and/or 4 secondary,
between Y1 and Y2. If 230 VAC is not present, replace
TNS3 and/or 4.
5. Modulating gas is not configured properly. 5. Check VB1285 wiring and ID plug version.
J. No Heat (YC’s only) CFM runs, GV
energizes, igniter does not spark.
1. Flame sense rod has failed.
1. Check for continuity between rod and ground and
replace flame sense rod if no continuity.
2. Wiring or terminal failure.
2. Check wiring and terminals. Repair or replace if
necessary.
3. Spark igniter has failed.
3. Spark igniter should fire when heat is called for and
155VAC is applied. If no spark, replace igniter.
4. High temp limit switch has failed.
4. Check for continuity across high temp limit switch and
replace if no continuity.
K. No Heat (YC’s only) GV does not
energize, CFM runs, igniter sparks.
1. Wiring or terminal failure.
1. Verify presence of 24 VAC between IGN J1-7 terminal to
ground, if not present, check wiring and terminals. Repair or
replace if necessary.
2. GV has failed.
2. Measure voltage between TH and TR on the gas valve
(GV). If 24 VAC is present and the GV will not open, replace
the GV.
3. Pressure switch failure.
3. Verify input gas pressure is not below minimum set on
low gas pressure switch.
L. No Heat (TE's only) Electric heat will not
operate.
1. Heater contactor(s) have failed.
1. Check for 24 VAC at electric heat, and DH contactor
coils. If 24 VAC is present on a call for heat, and the
contacts do not close, the contactor has failed.
2. Heater element temperature limit(s) is open.
2. Check line voltage between the element temperature
limit terminals located in heat section. If line voltage is
present, the limit is open. Repair heating unit, or replace
limit(s) as needed.
3. Wiring or terminal failure.
3. Check for wiring or terminal failure in control and power
circuit. Repair or replace if necessary.
4. Heater Element(s) has failed.
4. Check element and circuit integrity. Repair or replace as
necessary. Replace open elements.
5. Symbio™ 700 control system is defective.
See Symbio™ 700 Controller with Voyager 3 Packaged
Rooftop Air Conditioners (BAS-APG048*-EN) for Symbio
700 troubleshooting details.
Troubleshooting
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