OEM Carrier 40VA 120V–24V Control Transformer for Model PG8JAA036070ADJA (Part# HT01BC116)

This OEM control transformer is the factory-specified replacement for the Carrier PG8JAA036070ADJA gas furnace. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, gas valve, inducer relay, and control board. When the transformer fails, the entire low-voltage control circuit goes dead — you'll see a completely unresponsive thermostat, no inducer startup, and a furnace that won't attempt ignition at all. Replacing the transformer is one of the fastest repairs in the field and typically restores full system operation in under 30 minutes.

• Specs: 40VA rating | 120V primary | 24V secondary | 50/60 Hz single-phase | Wire-lead connection type | Compact form factor (approx. 3" L × 2-3/16" W × 2" H)
• OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances required by Carrier's control board. Undersized or off-tolerance generic transformers can brownout the control circuit under load, causing intermittent lockouts or premature board failure.
• Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 0V before touching leads). Label or photograph existing wire connections. Swap leads one at a time to avoid miswiring. Restore power only after all connections are secured.
• Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PG8JAA036070ADJA gas furnace. OEM part number HT01BC116 has been superseded by Carrier part HT680054, which is the current direct replacement shipped for all HT01BC116 orders. Also cross-references: HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, HT01AA012, HT01AQ110, 322666-701, 322953-302, B1810113. Verify your unit's data plate and existing transformer label before ordering. Our team is happy to confirm fitment — reach out before you buy.