What are the specs for this Transformer?

The correct replacement for ICP model WFMR110C066B3 — 120V to 24V 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 WFMR110C066B3 — 120V to 24V Control | Ships Today.

ICP

ICP 40VA Transformer for WFMR110C066B3 — 120V to 24V Control | Ships Today

Name: ICP 40VA Transformer for WFMR110C066B3 — 120V to 24V Control | Ships Today
Brand: ICP
SKU: 1177217-GEN
Price: 26.95 USD
Availability: InStock

SKU: 1177217-GEN Brand: ICP

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Overview

This OEM 40VA control transformer, part number 1177217, supplies the 24V low-voltage power for the ICP / Tempstar / Heil WFMR110C066B3 furnace. It steps incoming 120V line voltage down to 24V to drive the control board, thermostat circuit, gas valve, and relays. A failed transformer takes the entire low-voltage system offline — no thermostat response, no ignition, and often a blank or dead control board. Transformers fail from age, shorted control wiring, or a seized contactor/gas valve drawing excess current, so always check downstream loads after a failure.

Specifications

Spec	Value
Part Number	1177217
Type	Step-Down Control Transformer
Brand	ICP / Tempstar / Heil
Rating	40 VA
Primary Voltage	120V
Secondary Voltage	24V
Application	Gas Furnace control circuit

Compatibility

Direct OEM-fit replacement for the ICP-family WFMR110C066B3 furnace and shared platform models sold under Tempstar, Heil, Comfortmaker, and Arcoaire. Verify primary/secondary voltage and VA rating against your existing transformer.

Installation Guide

Safety First — Disconnect power at the switch and breaker. Verify zero voltage with a multimeter.
Access — Remove the furnace control/service panel.
Document — Photograph the primary (120V) and secondary (24V) lead connections before disconnecting.
Remove — Disconnect the leads, remove the mounting screw, and take out the old transformer.
Install — Mount the new 40VA transformer and reconnect 120V primary and 24V secondary leads per your photo.
Test — Restore power and confirm 24V at the secondary and normal control/ignition operation.

Signs You Need a Replacement

No 24V control power / dead control board
Thermostat unresponsive with line voltage present
Transformer humming loudly, overheating, or smelling burnt
Blown low-voltage fuse that recurs after reset

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 40VA Transformer for WFMR110...

$26.95

Frequently Asked Questions

Does this Transformer fit my ICP WFMR110C066B3 — 120V to 24V Control | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WFMR110C066B3 — 120V to 24V 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 WFMR110C066B3 — 120V to 24V 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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