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The Goodman 0130F00038 is a genuine OEM auxiliary (secondary) limit switch, identified by its light-blue color code, built for the ACES800603AXAA gas furnace. This auxiliary switch acts as a backup high-limit control, monitoring a secondary zone of the furnace and de-energizing the gas valve if temperatures exceed safe thresholds. It provides an extra layer of overheat protection beyond the primary limit and is essential for safe, code-compliant furnace operation.
The genuine OEM Goodman auxiliary switch is factory-calibrated to the precise temperature setpoint specified for this furnace's safety circuit. Because the auxiliary limit and primary limit (0130F00036) use different temperature ratings, substituting a generic part risks mismatched setpoints and unreliable protection. OEM ensures correct, predictable behavior.
Difficulty: Easy (DIY-friendly). Cut power at the breaker, note its mounting location (do not interchange with the primary limit), disconnect the terminals, unscrew, and install the replacement. Roughly 15 minutes with basic tools. When in doubt, hire a licensed HVAC pro.