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4YCY - Diagnostic Codes

Article ID: 628
Last updated: 4 Mar, 2020

Trane Package Unit: 4YCY

Re: Control Board Lockout / Fault Codes


Red Light Status Description
Off No Power or Control Failure
On Normal - No Call for Heat
Slow Flash Normal - Call for Heat
2 Ignition Failure
3 Pressure Switch Fault
4 High Limit Switch or Roll-Out Open
5 Flame Sensed with Gas Valve Off
6 Rollout Switch Open
7 W2 Received Without W1

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Article ID: 628
Last updated: 4 Mar, 2020
Revision: 4
Access: Public
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