What are the specs for this Transformer?

The correct replacement for ICP model WAPM304A1 — 40VA 208/230V to 24V | 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 WAPM304A1 — 40VA 208/230V to 24V | Ships Today.

ICP

ICP Transformer for WAPM304A1 — 40VA 208/230V to 24V | Ships Today

Name: ICP Transformer for WAPM304A1 — 40VA 208/230V to 24V | Ships Today
Brand: ICP
SKU: 1172028
Price: 37.64 USD
Availability: InStock

SKU: 1172028 Brand: ICP

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Overview

This OEM control transformer is the direct factory replacement for ICP/Tempstar/Heil model WAPM304A1. It steps incoming 208/230V line voltage down to the 24V control voltage that powers the thermostat, relays, and low-voltage circuitry. Rated at 40VA, it replaces ICP part number 1172028 (Transformer 208/230 to 24, 40VA). A failed transformer is a leading cause of a fully dead control system: a blank thermostat, a blower and contactor that won't energize, and an apparently powerless unit even though line voltage is present. Installing the correct OEM transformer restores dependable 24V control power without overloading the secondary winding.

Specifications

Spec	Value
Part Number	1172028
Type	Step-Down Control Transformer
Brand	ICP (Tempstar / Heil)
Rating	40VA
Primary Voltage	208/230V
Secondary Voltage	24V
Fits Model	WAPM304A1
Fitment	OEM Direct Replacement

Compatibility

Engineered specifically for the ICP/Tempstar/Heil WAPM304A1 air handler and other WAPM-series units that use the 40VA 208/230-to-24V transformer (part 1172028). Confirm your existing transformer's VA rating and primary tap match before installing.

Installation Guide

Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before handling wiring.
Access — Remove the control-compartment service panel.
Document — Photograph the primary (line) and secondary (24V) wire connections before disconnecting.
Remove — Disconnect the primary and secondary leads and unbolt the old transformer from its mounting bracket.
Install — Mount the new transformer, match the primary tap to your supply voltage (208V or 230V), and reconnect the secondary leads per your photo.
Test — Restore power, confirm 24V across the secondary terminals, then verify the thermostat powers up and the system energizes.

Signs You Need a Replacement

Blank thermostat with no 24V control power
Blower and contactor will not energize despite present line voltage
Burnt smell or visibly scorched transformer housing
Repeatedly blown low-voltage fuse or no measurable 24V on the secondary

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 WAPM304A1 — ...

$37.64

Frequently Asked Questions

Does this Transformer fit my ICP WAPM304A1 — 40VA 208/230V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WAPM304A1 — 40VA 208/230V to 24V | 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 WAPM304A1 — 40VA 208/230V to 24V | 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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