What are the specs for this Transformer?

The correct replacement for ICP model WFML110C066B1 | Ships Today 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 ICP equipment which lists the model number WFML110C066B1 | Ships Today.

ICP

ICP Transformer 40VA 120V to 24V for WFML110C066B1 | Ships Today

Name: ICP Transformer 40VA 120V to 24V for WFML110C066B1 | Ships Today
Brand: ICP
SKU: 1177217
Price: 31.14 USD
Availability: InStock

SKU: 1177217 Brand: ICP

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Overview

This genuine OEM control transformer (part number 1177217) supplies low-voltage power to the ICP/Tempstar/Heil WFML110C066B1 gas furnace. It steps down 120V line power to the 24V control circuit that operates the thermostat, gas valve, control board, and relays. Rated at 40VA, it delivers enough current to drive the full furnace control load. When a transformer fails — often from a shorted control wire, a stuck contactor, or simple age — the entire low-voltage system goes dead: the thermostat blanks out, the furnace won't fire, and no 24V is present at the control board. A fresh transformer restores reliable control power and protects downstream components.

Specifications

Spec	Value
Part Number	1177217
Type	Step-Down Control Transformer
Brand	ICP / Tempstar / Heil
Rating	40 VA
Primary Voltage	120V
Secondary Voltage	24V
Fitment	OEM Replacement

Compatibility

Direct OEM replacement for the ICP WFML110C066B1 furnace and compatible across the ICP family — Tempstar, Heil, Comfortmaker, and Day & Night units that specify the 40VA 120-24V transformer 1177217. Verify the VA rating and primary voltage tap on your existing unit before installing.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
Access — Remove the furnace control compartment service panel.
Document — Photograph all primary and secondary wire connections before disconnecting.
Remove — Unbolt the transformer mounting bracket and disconnect the line and low-voltage leads.
Install — Mount the new transformer, match the 120V primary tap, and reconnect the 24V secondary per your photo.
Test — Restore power and confirm 24V at the secondary and a live thermostat display.

Signs You Need a Replacement

Thermostat screen is blank or unresponsive.
Furnace gets no 24V control power and will not start a heat cycle.
Transformer is hot to the touch, buzzing loudly, or smells burnt.
Repeated control fuse blowing on the board.

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.

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 $75
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

ICP Transformer 40VA 120V to 24V...

$31.14

Frequently Asked Questions

Does this Transformer fit my ICP WFML110C066B1 | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WFML110C066B1 | Ships Today. 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 ICP WFML110C066B1 | Ships Today?

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 ICP 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 ICP 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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