Trane Voyager CV Installation And Maintenance Manual page 112

Diagnostics
Table 83. Troubleshooting
SYMPTOM
G. ODM 3 and/or 4 will not
cycle.
H. CPR2 and 3 (if applicable)
will not operate.
I. Indoor motor (IDM) will not
operate
J. No Heat (YC's only) CFM will
not run, IP warms up, GV is
energized
K. No Heat (YC's only) CFM
runs, GV energizes, IP does
not warm up.
L. No Heat (YC's only) GV does
not energize, CFM runs, IP
warms up
M. Low Heat Capacity
Intermittent Heat. (YC's only)
CFM runs in LO or HI speed
only, or; may not operate at all
in one speed or the other.
112
PROBABLE CAUSE
1. OAS has failed.
2. ODM3 and/or 4 capacitor has failed. 2. Check ODM capacitor, replace if necessary.
3. Wiring, terminal, or CC2 contactor
failure.
4. ODM3 and/or 4 has failed.
5. RTRM is defective.
6. ODF20 has failed.
1. No power to CC2 and/or 3 coil. Cool
Failure Possible.
2. CC2 and/or 3 coil defective. Cool
Failure Indicated.
3. CC2 and/or 3 contacts defective.
4. RTRM is defective.
5. DLT2 and DLT3 has tripped.
1. IDM has failed.
2. Wiring, terminal, or contactor failure.
3. ZSM is defective.
4. RTRM is defective.
5. Supply Fan Proving (FFS) switch has
opened.
1. CFM has failed.
2. CFM capacitor has failed.
3. Wiring, or terminal failure.
4. TNS3 and/or 4 has failed. (460/575 V
units only)
5. Modulating gas is not configured
properly.
1. TNS3 and/or 4 has failed.
2. Wiring or terminal failure.
3. IP has failed.
1. Wiring or terminal failure.
2. GV has failed, in two stage units
3. Pressure switch failure, in mod heat
units
CFM has failed.
RECOMMENDED ACTION
1. Perform OAS Resistance/Temperature check. Replace if necessary.
3. Check wires, terminals, and CC2. Repair or replace if necessary.
4. Check ODM, replace if necessary.
5. Replace RTRM module
6. Check for proper voltage and contact closure. ODF20 relay has a 24
VAC holding coil. If voltage is present, replace relay.
1. Check wiring, terminals and applicable controls (CCB2, CCB3, HPC2,
LPC2, WTL2, WTL3, TDL2 & TDL3)
2. Verify integrity of CC2 and/or 3 coil windings. If open or shorted
replace CC2 and/or CC3.
3. If 24 VAC is present at CC2 and/or 3 coil, replace relay.
4. 24 VAC is not present at CC2 and/or 3 coil. Reset the Cool Failure by
cycling the service disconnect. Place the unit into Cool Stage 2 Mode, step
4 for constant Volume or step 6 for variable air volume, to insure CPR2
and 3 Compressor operation. Check input devices in #1 & #2 above, if
no controls have opened, and CC2 and/or 3 will not close, replace RTRM.
4. Check for leaks, Open wire connections, Lose quick connect terminals,
TDL2 and TDL3 resistance check.
1. Check IDM, replace if necessary.
2. Check wiring, terminals and F contactor. Repair or replace wiring,
terminals, or fan contactor F.
3. Place unit in test mode. If the fan operates in the test mode, test the
ZSM using the appropriate test procedures.
4. Check the RTRM fan output. Locate P2-1 on the RTRM. Measure
voltage to ground. If 24 VAC is not present on a call for fan, replace the
RTRM.
5. Check FFS and belts, repair or replace if necessary.
1. Check CFM, replace if necessary.
2. Disconnect BROWN wires from capacitor, test, and replace if
necessary.
3. Check wiring, and terminals. Repair, or replace if necessary.
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. Check RTOM wiring and control board software versions.
1. Check for 115 VAC at TNS3 and/or 4 secondary, between X1 and X2.
If 115 VAC is not present, replace TNS3 and/or 4.
2. Check wiring and terminals. Repair or replace if necessary.
3. With 115 VAC applied to IP, warm up should take place. Cold resistance
of IP should be a minimum of 50 Ohms. Nominal current should be 2.5
to 3.0 Amps.
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. 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. In mod heat units, verify the pressure switch is wired correctly. If wired
correctly, verify operation of pressure switch.
Check CFM, test LO and HI speed windings.
RT-SVX34F-EN