What are the specs for this Transformer?

The correct replacement for Carrier model PH3ZNB024000AB is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number PH3ZNB024000AB.

Is this transformer compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Control Transformer 40VA 208/230V for PH3ZNB024000AB

Name: OEM Carrier Control Transformer 40VA 208/230V for PH3ZNB024000AB
Brand: Carrier
SKU: CARRIE-PH3ZNB024000AB-TRANSFORMER-HT01BD209
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-PH3ZNB024000AB-TRANSFORMER-HT01BD209 Brand: Carrier

✓ Guaranteed to fit PH3ZNB024000AB — or your money back. Terms

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OEM Carrier Control Transformer 40VA 208/230V–24V for Model PH3ZNB024000AB

This OEM control transformer (part# HT01BD209) is the factory-specified replacement for the Carrier PH3ZNB024000AB packaged unit. The transformer steps down line voltage (208/230V) to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, the entire control circuit goes dark — symptoms include a completely unresponsive thermostat, a system that won't respond to any call for heating or cooling, or a blown 3A control fuse that keeps returning without explanation.

Specs: 208/230V primary | 24V secondary | 40VA capacity | 50/60 Hz | Class 2 control transformer | Direct OEM replacement for HT01BD207, HT01CN232, and 9076-00
OEM vs Generic: OEM transformers are wound and potted to exact Carrier factory tolerances, ensuring steady 24V output under full VA load. Generic equivalents can sag under load, causing intermittent lockouts, nuisance tripping of safety circuits, or premature control board failure.
Install difficulty: 3/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter (to verify 24V output post-install), and needle-nose pliers. Label all low-voltage wires before disconnecting. Verify incoming line voltage matches transformer primary tap.
Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3 PM local time.

Compatibility: Factory-matched for Carrier model PH3ZNB024000AB packaged units. Also replaces obsolete part numbers HT01BD207, HT01CN232, and 9076-00. Always verify line voltage (208V or 230V) against your unit's data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $99
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Carrier Control Transformer ...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier PH3ZNB024000AB?

Yes. This is the factory-specified OEM transformer for the Carrier PH3ZNB024000AB. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the transformer on my Carrier PH3ZNB024000AB?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.

My thermostat has no power. What failed?

Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.

Is this transformer compatible with Bryant or Payne too?

Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Carrier transformer?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Carrier Control Transformer 40VA 208/230V for PH3ZNB024000AB

OEM Carrier Control Transformer 40VA 208/230V–24V for Model PH3ZNB024000AB

Shipping Information

Return Policy

Frequently Asked Questions