45
Inducer draft motor (IDM) family on this generation (shared diagnostic path with 57)
This code typically points to
- Inducer high-/low-speed issues
- Wiring to IDM
- Run capacitor issue
- IFC output issue
Next checks to confirm
- Public snippet explicitly says: code 45 or 57 — check IDM
- Verify voltage to IDM high-speed tap
- Check run capacitor
- Inspect wiring
- Verify voltage on IDM pin at IFC
Escalation
Heating sequence terminates if IDM proving fails
Reset behavior
Clears when IDM operation is restored.
Urgent
Fix now