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Trane Trane A951X080BU4SA E12: Open low-voltage fuse Troubleshooting · TraneTrane A951X080BU4SA E12: Open low-voltage fuseTroubleshooting code E12 Trane Trane A951X040BU3SA E01: Internal control failure Troubleshooting · TraneTrane A951X040BU3SA E01: Internal control failureTroubleshooting code E01 Trane Trane A951X040BU3SA E2.1: Retry exceeded; flame never sensed Troubleshooting · TraneTrane A951X040BU3SA E2.1: Retry exceeded; flame never sensedTroubleshooting code E2.1 Trane Trane A951X040BU3SA E2.2: Recycles exceeded; established flame was lost Troubleshooting · TraneTrane A951X040BU3SA E2.2: Recycles exceeded; established flame was lostTroubleshooting code E2.2 Trane Trane A951X040BU3SA E2.3: First-stage gas valve not energized when expected Troubleshooting · TraneTrane A951X040BU3SA E2.3: First-stage gas valve not energized when expectedTroubleshooting code E2.3 Trane Trane A951X040BU3SA E3.1: Shorted first-stage pressure switch Troubleshooting · TraneTrane A951X040BU3SA E3.1: Shorted first-stage pressure switchTroubleshooting code E3.1 Trane Trane A951X040BU3SA E3.2: Open first-stage pressure switch Troubleshooting · TraneTrane A951X040BU3SA E3.2: Open first-stage pressure switchTroubleshooting code E3.2 Trane Trane A951X040BU3SA E04: Open limit circuit Troubleshooting · TraneTrane A951X040BU3SA E04: Open limit circuitTroubleshooting code E04 Trane Trane A951X040BU3SA E05: Flame detected when it should not be present Troubleshooting · TraneTrane A951X040BU3SA E05: Flame detected when it should not be presentTroubleshooting code E05 Trane Trane A951X040BU3SA E6.1: Reversed voltage polarity Troubleshooting · TraneTrane A951X040BU3SA E6.1: Reversed voltage polarityTroubleshooting code E6.1 Trane Trane A951X040BU3SA E6.2: Bad grounding Troubleshooting · TraneTrane A951X040BU3SA E6.2: Bad groundingTroubleshooting code E6.2 Trane Trane A951X040BU3SA E6.3: Igniter relay or open igniter fault Troubleshooting · TraneTrane A951X040BU3SA E6.3: Igniter relay or open igniter faultTroubleshooting code E6.3