What are the specs for this Transformer?

The correct replacement for ICP model WPG3484115LKC1 — OEM 1173691 | 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 WPG3484115LKC1 — OEM 1173691 | Ships Today.

ICP

ICP 40VA Transformer 208/230V to 24V for WPG3484115LKC1 — OEM 1173691 | Ships Today

Name: ICP 40VA Transformer 208/230V to 24V for WPG3484115LKC1 — OEM 1173691 | Ships Today
Brand: ICP
SKU: 1178431
Price: 46.80 USD
Availability: InStock

SKU: 1178431 Brand: ICP

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Overview

This OEM control transformer (part number 1173691) steps down 208/230V line voltage to the 24V control voltage used by the ICP/Tempstar/Heil WPG3484115LKC1 packaged unit, and is supplied with the matching 24V barrier/junction component (part number 1178431). Rated at 40VA, it powers the thermostat circuit, control board, gas valve, and relays. A failed transformer means no 24V control power at all — the unit will be completely dead with no thermostat response even though line voltage is present. Transformers commonly fail from a shorted control wire, a stuck contactor coil, or simple age.

Specifications

Spec	Value
Part Numbers	1173691 (transformer), 1178431 (24V barrier)
Type	Control Transformer
Primary Voltage	208/230V
Secondary Voltage	24V
Rating	40 VA
Brand	ICP / Tempstar / Heil
Fit	OEM

Compatibility

Direct-fit replacement for the ICP/Tempstar/Heil/Comfortmaker WPG3484115LKC1 packaged gas/electric unit and related WPG-series models using OEM transformer 1173691 with the 1178431 24V barrier.

Installation Guide

Safety First — Disconnect power and verify zero voltage with a multimeter on both line and control sides.
Access — Remove the control compartment service panel.
Document — Photograph the primary (line) and secondary (24V) wiring before disconnecting.
Remove — Disconnect the primary and secondary leads, then remove the transformer mounting screws.
Install — Mount the new transformer and barrier, matching primary taps to your supply voltage and reconnecting per your photo.
Test — Restore power and confirm 24V across the secondary terminals and normal thermostat operation.

Signs You Need a Replacement

Completely unresponsive unit with line voltage present
No 24V reading across the secondary terminals
Repeatedly blown control fuse from a shorted transformer
Burnt smell or visibly scorched transformer housing

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 208/230V to...

$46.80

Frequently Asked Questions

Does this Transformer fit my ICP WPG3484115LKC1 — OEM 1173691 | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WPG3484115LKC1 — OEM 1173691 | 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 WPG3484115LKC1 — OEM 1173691 | 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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