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OEM Carrier Transformer 40VA 208/230V-24V for PF4MNB037T00AAAA
Carrier

OEM Carrier Transformer 40VA 208/230V-24V for PF4MNB037T00AAAA

SKU: CARRIE-PF4MNB037T00AAAA-TRANSFORMER-HT01CN241 Brand: Carrier
✓ Guaranteed to fit PF4MNB037T00AAAA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer 208/230V–24V for Model PF4MNB037T00AAAA

This is the genuine OEM Carrier replacement transformer (part number HT01CN241), factory-specified for the Carrier PF4MNB037T00AAAA fan coil and air handler units. The transformer steps down 208/230V line voltage to 24V AC to power the low-voltage control circuit — including the thermostat, contactors, relays, and control board. When this transformer fails, the entire control circuit goes dark: the thermostat display may go blank, the system won't respond to calls for heating or cooling, and no low-voltage components will energize.

  • Specs: 208/230V primary voltage | 24V secondary voltage | 40VA power rating | Basler Electric model BE28316007 | Direct OEM drop-in replacement
  • OEM vs Generic: OEM transformers are wound and encapsulated to Carrier's exact factory specifications, ensuring proper VA headroom and stable 24V output under full control-circuit load. Generic units often run undersized VA ratings, causing voltage sag that leads to erratic relay chatter, nuisance lockouts, and premature board failures.
  • Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 24V output at secondary terminals before reassembly. Photograph all wiring connections before disconnecting.
  • Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Directly replaces the factory-installed transformer in the Carrier PF4MNB037T00AAAA fan coil unit. Also used across multiple Carrier air handler and fan coil platforms — confirm your unit's data plate shows 208/230V primary and 24V/40VA secondary before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy.

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

Frequently Asked Questions

Does this Transformer fit my Carrier PF4MNB037T00AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier PF4MNB037T00AAAA. 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 PF4MNB037T00AAAA?
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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Mike Rivera
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