OEM Carrier Furnace Transformer 40VA 120V to 24V for Model UPFLOW070FAUS12B

This OEM Carrier transformer (part number HT01CN001) is the factory-specified control circuit transformer for the Carrier UPFLOW070FAUS12B upflow gas furnace. It steps down 120V line voltage to a safe 24V signal used by the thermostat, control board, gas valve, and all low-voltage control circuits throughout the system. When this transformer fails, the entire control circuit goes dark — the thermostat loses power, the furnace won't respond to a call for heat, and the system enters a complete no-operation lockout. Common failure causes include short circuits in the low-voltage control wiring, electrical surges, and natural wear over time.

• Specs: 120V primary | 24V / 12V secondary | 40VA rated | Factory-authorized OEM replacement | Replaces legacy part numbers HT01BJ115, 19EA41612, 19EA42612
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, built to exact VA and voltage tolerances. Off-brand transformers may be rated at ±10% VA, which can cause chronic nuisance tripping, control board instability, or premature failure of downstream low-voltage components.
• Install difficulty: 3/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install), and wire labels or tape to document low-voltage wiring connections before removal.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as a direct OEM replacement for the Carrier UPFLOW070FAUS12B upflow gas furnace. Verify your unit's data plate confirms 120V input and 24V control circuit before ordering. Not sure it's the right fit? Our HVAC parts specialists verify fitment before you buy — contact us before placing your order.