Fault Code Lookup

HVAC Sales Master

Open Inducer Limit Error

This code typically points to

Open inducer limit

Next checks to confirm

Check inducer limit
Inducer retry behavior documented in abnormal-condition section

Escalation

Heating fault; stage fallback/retry behavior documented separately

Reset behavior

Clears when inducer limit condition clears.

Urgent

Fix now

⚠ Cross-generation conflict

Code 9 means completely different things across Trane/American Standard legacy platforms. On UD2/DD2 and UC1/DC1, it's an ignitor/grounding fault. On AUY/TUY and AUH2/TUH2, it's an open inducer limit — totally different diagnostic path. Your model prefix determines which it is.

Source

Trane 18-CD26D1-13 Installer's Guide, p.42-43

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