Service Alert: Symbio 700 Board Failures (No Fault Found) - Troubleshoot before considering return

Summary:

Trane has seen a high percentage of S700 UC boards returned with no fault found. There is a need to investigate board failures in the field before replacing the board. Properly troubleshooting the board can prevent unwarranted labor/parts costs, extra site visits, and a misdiagnosis of the true problem/issue,

Link to contact Tech Support for help        

What are known Diagnostics or Symptoms:

Compressor Proving Faults.

Product Family: NextGen Voyager 3, Large and Small Precedent, Odyssey, Large Foundation (A2L)                         

Model Prefix(s) & Configuration details: YSJ, YHJ,YSK,YHK, YZJ, YZK, TSJ, THJ, TSK, THK, TZJ, TZK, WSJ, WHJ, WSK, WHK, DSJ, DHJ, DSK, DHJ, TTA, TWA, TCD, TCH, TCF, TCR, TED, TEH, TEF, TER, YCD, YCH, YCF, YCR, E/GDK180-300

Ship Date range:

Serial range: 2020****YA to 26053162YA for Single Condenser Fan Odyssey Condensing Units

Serial range: 2020****TA to 26044131TA for Dual Condenser Fan Odyssey Condensing Units

Serial range: 2450*****L to 260610979L for 3-5T Small Precedent Units

Serial range: 2250*****L to 260610811L for 6-12.5T Small Precedent Units

Serial range: 2250*****D to 255011483D for Large Precedent Units

Serial range: C23A***** to C26A00138 for Voyager 3 Units

Serial range: 2501****JA to 26064234JA for Large Foundation Units

What actions can I take now: 

Complete troubleshooting as outlined below first before replacing any parts. 

For confirmed Symbio 700 relay failures, replace the Symbio 700 and Adapter board using the kits listed below, see matrix for kit number vs. product. 

*Adv. License is not applicable to Foundation Products

First, Check for latest firmware revision. Make sure it is up to date. 

Click here on how to update firmware.

Second, Verify your unit configuration. Make sure it is correct.

Click here for how to check the configuration with the mobile app. 

Click here for how to check the configuration using the onboard display. 

Finally, Contact Technical Support

Link to contact Tech Support for help   

When submitting ticket request, please put in unit diagnostic in the subject line. 
 

PLEASE FOLLOW TROUBLESHOOTING STEPS OUTLINED BELOW BEFORE CONTACTING TECHNICAL SUPPORT.

• FOR VOYAGER 3 FOLLOW THESE STEPS:
• This diagnostic is created when the unit calls for a compressor contractor to energize, and the contactor does not pull in or drops out during operation.  This would normally indicate that a safety (HPC or DTL) has opened, but anything that causes the aux contacts on the contactor to show as open when they should be closed will generate this diagnostic.
• If the contactor does not pull in when requested, check wire connections.  Poor wire connections in the wire harness seem to be the biggest issue we are seeing, primarily the two pin harness connectors for the HPC's, DTL's, and the compressor contactor coils.  (See attached schematic).  These connectors are only there for ease of assembly purposes.  We have suggested removing them and using wire nuts or splices to correct the issue as a field fix.  In many cases, this solves the problem.
• Other, less obvious, causes can be a tripped transformer or poor harness connection on the Adapter Board.  Compressor Contactors 1 and 2 get their 24 VAC power from the transformer connected to J25 on the Adapter Board.  Compressor Contactor 3 gets its 24 VAC power from the transformer connected to J8 on the Adapter Board.  Verify that these two connectors on the Adapter Board are receiving 24 VAC.  If either of these transformers have tripped, failed, or have a poor harness connection the unit will generate this diagnostic when it calls for the compressor to start.
• It is also possible to have a bad aux switch on the compressor contact.  If the contactor pulls in, but drops out a few seconds later, check the proving switch and wiring.
• A test that can be performed is:
• 1.) Power down the unit/verify that there is no voltage present on the compressor contactors
• 2.) Remove the fuses for the compressor or Load wiring to the contactor of the compressor you're troubleshooting (in this example we'll cover CC1/Compressor 1 proving).
• 3.) Insert a jumper into the P8 plug between pins 4 & 5 (Orange and Yellow wires...see snip below from the schematic).

• 4.) Power on the unit and verify that the CC1 contactor pulls in and you have 24Vac present on P8 pin 3  (blue wire) for the proving input...if the CC1 does not pull in then there could be a lack of 24Vac, loose connection, or an open safety as mentioned above. If the CC1 does pull in and you do have 24Vac on pin 3 of P8 and you continue to get Compressor 1 Proving diagnostics then there could be an issue with the Symbio 700. You can repeat/copy these steps for CC2 and CC3 (Compressor 2 is the P9 and Compressor 3 is the P10).

  

  

   

• FOR LARGE PRECEDENT/FOUNDATION AND SMALL PRECEDENT FOLLOW THESE STEPS:
  • Symbio 700 - Compressor Proving Circuit Troubleshooting - Precedent and Large Foundation – Trane Commercial HVAC Help Center

• FOR ODYSSEY FOLLOW THESE STEPS:

  • Symbio™ 700 - Compressor Proving Circuit(s) Troubleshooting for Odyssey – Trane Commercial HVAC Help Center

   

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  CONTACT TECHNICAL SUPPORT FOR ASSISTANCE IN DIAGNOSING S700 BOARDS IF NEEDED. IF RMA IS REQUIRED, CONTACT SUPPORT FOR TICKET NUMBER.

  • RECORD ZENDESK TICKET NUMBER IN FQA BEFORE COMPLETING JOB.
  • Enter FQA (Field Quality Alert)
  • Provide specific data or pictures
  • Hold – do not Start/Install
  • Return Defective Part
  • Replace Part