What are the specs for this Transformer?

The correct replacement for ICP model WJA342000KTP0A1 — Class II Step-Down | 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 WJA342000KTP0A1 — Class II Step-Down | Ships Today.

ICP

ICP Transformer 40VA 208/230V to 24V for WJA342000KTP0A1 — Class II Step-Down | Ships Today

Name: ICP Transformer 40VA 208/230V to 24V for WJA342000KTP0A1 — Class II Step-Down | Ships Today
Brand: ICP
SKU: 1176032
Price: 37.70 USD
Availability: InStock

SKU: 1176032 Brand: ICP

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Overview

This is a genuine OEM 40VA control transformer (OEM part #1173691) for the ICP / Tempstar / Heil WJA342000KTP0A1 system, supplied with the matching 24V barrier (OEM part #1176032). The transformer steps the incoming 208/230V line voltage down to the 24V control voltage that powers the thermostat, contactor coil, control board, and safety circuits. Its 40VA rating provides enough current to drive the low-voltage components without overloading. When a transformer fails, the entire low-voltage control side goes dead: the thermostat may go blank, the contactor will not pull in, and the system ignores calls for heating or cooling even with line power present. Typical causes are a shorted contactor coil, a pinched 24V wire, or a power surge.

Specifications

Spec	Value
Part Number	1173691 (transformer), 1176032 (barrier)
Type	Class II Step-Down Control Transformer
Brand	ICP / Tempstar / Heil
VA Rating	40 VA
Primary Voltage	208 / 230 V
Secondary Voltage	24 V

Compatibility

Engineered for the ICP / Tempstar / Heil WJA342000KTP0A1 and compatible 208/230V residential HVAC equipment using a 24V control circuit. Always confirm the original transformer's primary/secondary voltage and VA rating before installing.

Installation Guide

Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
Access — Remove the service panel to reach the control area.
Document — Photograph all primary and secondary wiring before disconnecting.
Remove — Disconnect the line-voltage and 24V leads, then unbolt the old transformer and barrier from the mounting bracket.
Install — Mount the new transformer and 24V barrier, then reconnect the primary and secondary wires exactly per your photo.
Test — Restore power and confirm 24V at the secondary terminals and proper system operation.

Signs You Need a Replacement

No 24V control voltage / blank thermostat with line power present
Contactor will not pull in on a call for cooling
Visible scorching, swelling, or a burnt smell at the transformer
Repeatedly blown low-voltage fuse after a shorted coil

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 40VA 208/230V to...

$37.70

Frequently Asked Questions

Does this Transformer fit my ICP WJA342000KTP0A1 — Class II Step-Down | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WJA342000KTP0A1 — Class II Step-Down | 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 WJA342000KTP0A1 — Class II Step-Down | 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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