What are the specs for this Transformer?

The correct replacement for ICP model WPH4304000RKA1 — 40VA Control Transformer | 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 WPH4304000RKA1 — 40VA Control Transformer | Ships Today.

ICP

ICP 24V Transformer for WPH4304000RKA1 — 40VA Control Transformer | Ships Today

Name: ICP 24V Transformer for WPH4304000RKA1 — 40VA Control Transformer | Ships Today
Brand: ICP
SKU: WPH4304000RKA1-GEN
Price: 34.00 USD
Availability: InStock

SKU: WPH4304000RKA1-GEN Brand: ICP

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Overview

This OEM 24-volt control transformer steps line voltage down to the 24V needed to power the low-voltage control circuit on your ICP/Tempstar/Heil WPH4304000RKA1 heat pump. The transformer feeds the thermostat, control board, contactor coil, and reversing valve solenoid (24V coil) — without it, none of the low-voltage controls function. Rated at 40VA, it provides the control-circuit power these systems require. When a transformer fails, the entire 24V circuit goes dead: no thermostat display, no relay engagement, and a completely unresponsive system. Failures usually trace back to a shorted control wire or a stuck contactor coil drawing excess current.

Specifications

Spec	Value
Type	Control Transformer
Brand	ICP (Tempstar / Heil)
Secondary Voltage	24V
Rating	40 VA
Application	Low-Voltage Control Circuit / Reversing Valve 24V Coil

Compatibility

OEM-grade fit for the ICP/Tempstar/Heil WPH4304000RKA1 heat pump control circuit. Compatible with ICP-family systems using a 24V, 40VA control transformer. Verify primary voltage, secondary voltage, and VA rating against your existing transformer before installing.

Installation Guide

Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter on both primary and secondary leads.
Access — Remove the control compartment or electrical panel cover.
Document — Photograph the primary (line) and secondary (24V) wire connections before disconnecting.
Remove — Transfer the wires one at a time, then unbolt the old transformer from its mounting bracket.
Install — Mount the new transformer and reconnect primary and secondary leads exactly per your photo.
Test — Restore power and confirm 24V across the secondary terminals and normal thermostat/control operation.

Signs You Need a Replacement

Blank thermostat and no low-voltage control response
Contactor and reversing valve coil won't energize
No measurable 24V on the secondary terminals
Repeated blown control fuse from a shorted transformer

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 24V Transformer for WPH43040...

$34.00

Frequently Asked Questions

Does this Transformer fit my ICP WPH4304000RKA1 — 40VA Control Transformer | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP WPH4304000RKA1 — 40VA Control Transformer | 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 WPH4304000RKA1 — 40VA Control Transformer | 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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