What are the specs for this Transformer?

The correct replacement for ICP model WPG4364090LKA1 — 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 WPG4364090LKA1 — 208/230V to 24V | Ships Today.

ICP

ICP 40VA Transformer for WPG4364090LKA1 — 208/230V to 24V | Ships Today

Name: ICP 40VA Transformer for WPG4364090LKA1 — 208/230V to 24V | Ships Today
Brand: ICP
SKU: 1178431
Price: 48.04 USD
Availability: InStock

SKU: 1178431 Brand: ICP

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Overview

This OEM 40VA control transformer supplies 24V power to the ICP/Heil/Tempstar WPG4364090LKA1 packaged unit. It steps line voltage (208/230V) down to 24V to run the control board, thermostat, gas valve, contactor coil, and relays. It replaces OEM parts 1173691 (TRANS 208/230>24 40VA) and 1178431 (BARRIER 24V). When a transformer fails — usually an open winding from a shorted thermostat wire or a failed contactor coil drawing too much current — the entire low-voltage control circuit goes dead and the system won't respond to the thermostat.

Specifications

Spec	Value
OEM Part Numbers	1173691, 1178431
Type	Step-Down Control Transformer
Brand	ICP (Heil / Tempstar / Comfortmaker)
Rating	40 VA
Primary Voltage	208/230V
Secondary Voltage	24V
Application	Low-voltage control circuit

Compatibility

Direct-fit replacement for the ICP/Heil/Tempstar/Comfortmaker WPG4364090LKA1 packaged unit and related models that shipped with OEM transformer 1173691. Confirm primary/secondary voltage, VA rating, and mounting before installing.

Installation Guide

Safety First — Disconnect power at the unit disconnect. Verify zero voltage on the primary leads with a multimeter.
Access — Remove the control/electrical panel.
Document — Photograph the primary and secondary wiring before disconnecting.
Remove — Label and disconnect the leads, then unbolt the old transformer from its bracket.
Install — Mount the new transformer, match the correct primary tap for your line voltage, and reconnect per your photo.
Test — Restore power and confirm ~24V across the secondary terminals and normal control operation.

Signs You Need a Replacement

No 24V at the control board or thermostat
System completely unresponsive to the thermostat
Blown low-voltage fuse that reblows after replacement
Burnt smell or visibly scorched transformer windings

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 WPG4364...

$48.04

Frequently Asked Questions

Does this Transformer fit my ICP WPG4364090LKA1 — 208/230V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WPG4364090LKA1 — 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 WPG4364090LKA1 — 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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