What are the specs for this Transformer?

The correct replacement for ICP model WFMR090B042A1 — 40VA 120/24V Furnace Control | 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 WFMR090B042A1 — 40VA 120/24V Furnace Control | Ships Today.

ICP

ICP Transformer for WFMR090B042A1 — 40VA 120/24V Furnace Control | Ships Today

Name: ICP Transformer for WFMR090B042A1 — 40VA 120/24V Furnace Control | Ships Today
Brand: ICP
SKU: 1176944
Price: 36.40 USD
Availability: InStock

SKU: 1176944 Brand: ICP

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Overview

This OEM control transformer (part number 1176944) steps line voltage down to the 24V control voltage that operates your ICP Tempstar Heil WFMR090B042A1 furnace's circuit board, gas valve, igniter, and thermostat. Rated at 40VA with a 120V primary and 24V secondary, it is the heart of the low-voltage control circuit. When a transformer fails, the entire control system goes dead: no thermostat response, no ignition sequence, and no blower call. Common causes of failure include a shorted secondary, voltage spikes, or an overloaded control circuit that burns the internal windings.

Specifications

Spec	Value
Part Number	1176944
Type	Step-Down Control Transformer
Brand	ICP (Tempstar / Heil)
VA Rating	40 VA
Primary Voltage	120 V
Secondary Voltage	24 V
Fitment	OEM Replacement

Compatibility

Engineered as a direct OEM replacement for the ICP Tempstar Heil WFMR090B042A1 furnace. The 40VA 120/24V configuration is also used across many comparable ICP-family gas furnace platforms — always confirm your existing transformer's VA and voltage ratings 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/blower service panel.
Document — Photograph all primary and secondary wire connections before disconnecting anything.
Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the old transformer from its bracket.
Install — Mount the new transformer, reconnect the primary and secondary leads exactly per your photo.
Test — Restore power and confirm 24V at the secondary, then verify the furnace completes a normal call for heat.

Signs You Need a Replacement

Furnace is completely unresponsive with no thermostat display or 24V control power.
Repeated blown low-voltage fuses on the control board.
No 24V output measured at the secondary while 120V is present at the primary.
Visible scorching, melted housing, or a burnt-electrical smell at the transformer.

Shipping & Returns

Ships same day 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 for WFMR090B042A...

$36.40

Frequently Asked Questions

Does this Transformer fit my ICP WFMR090B042A1 — 40VA 120/24V Furnace Control | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WFMR090B042A1 — 40VA 120/24V Furnace Control | 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 WFMR090B042A1 — 40VA 120/24V Furnace Control | 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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