Fault Code Lookup

HVAC Sales Master

8

Low flame sense

This code typically points to

Weak flame-sense signal

Next checks to confirm

Clean flame sensor
Measure flame current

Escalation

Can produce recycle/lockout

Reset behavior

Clears when flame signal strengthens.

Urgent

Fix now

Source

Trane 18-CD20D3-21 Installer's Guide, p.36

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