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KB Home / Equipment / Rooftop Units / Trane / YSC / YSC - Ignition Fault Codes

YSC - Ignition Fault Codes

Article ID: 494
Last updated: 13 Nov, 2020

Trane Package Unit: YSC

Re: Ignition Lockout Codes

Trane YSC package units are multi-stage gas/electric units.

  • These units utilize an Ignition Control Board (ICB) with a built-in spark generator for electronic ignition control.
  • The ICB has a diagnostic light to indicate heat status.
Light Status Description
Off Check Control Power
Continuous On Normal, No Heat Call
Slow Flash Normal, Call for Heat
Fast Flash Internal Control Failure
1 Communication Failure
2 Ignition Lockout
3 Pressure Switch Problem
4 High Limit (TCO1 or TCO2) Open
5 Flame Sensed with Gas Valve Off
6 Flame Rollout Switch (FL) Open
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Article ID: 494
Last updated: 13 Nov, 2020
Revision: 5
Access: Public
Views: 1971
Comments: 0
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