What are the specs for this Transformer?

The correct replacement for ICP model RHS243S0CA0AAAA — 40VA Class 2 Control Power | 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 RHS243S0CA0AAAA — 40VA Class 2 Control Power | Ships Today.

ICP

ICP 24V Transformer for RHS243S0CA0AAAA — 40VA Class 2 Control Power | Ships Today

Name: ICP 24V Transformer for RHS243S0CA0AAAA — 40VA Class 2 Control Power | Ships Today
Brand: ICP
SKU: 1172619
Price: 45.44 USD
Availability: InStock

SKU: 1172619 Brand: ICP

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Overview

This OEM 24V control transformer supplies the low-voltage power that operates the contactors, relays, and reversing-valve coil inside your ICP RHS243S0CA0AAAA heat pump. It steps line voltage down to a stable 24 volts of Class 2 control power rated at 40VA. Companion OEM parts on this control circuit include the 24V reversing-valve coil (part 1172619) and the 24V DPST relay (part 1178205, T92P7A22-24). When a control transformer fails, the system goes completely dead at the thermostat — no fan, no compressor, no response — even with high-voltage power present at the disconnect. Buzzing, a repeatedly blown low-voltage fuse, or scorched secondary leads are the usual symptoms.

Specifications

Spec	Value
Part Number	Control transformer (24V)
Related OEM Parts	1172619, 1178205
Type	Class 2 control transformer
Brand	ICP (Tempstar / Heil / Comfortmaker family)
Secondary Voltage	24V
Rating	40VA

Compatibility

Direct fit for the ICP RHS243S0CA0AAAA heat pump and other ICP-built systems using the same 24V control circuit. ICP equipment is sold under the Tempstar, Heil, Comfortmaker, Arcoaire, and KeepRite labels, so this transformer also services equivalent models across those brands. Confirm the VA rating and voltage of your existing transformer before installing.

Installation Guide

Safety First — Disconnect power at the unit and breaker, then verify zero voltage with a multimeter before touching any wiring.
Access — Remove the service panel to expose the control box.
Document — Photograph every primary and secondary lead before disconnecting.
Remove — Unfasten the failed transformer and disconnect the primary (line) and secondary (24V) leads.
Install — Mount the new transformer, match the primary taps to your supply voltage, and reconnect the secondary leads exactly as photographed.
Test — Restore power and confirm 24V across the secondary terminals and a normal thermostat call.

Signs You Need a Replacement

System is completely unresponsive at the thermostat despite line power
Repeatedly blown low-voltage control fuse
Audible buzzing or humming from the control box
No measurable 24V on the secondary side under load

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 RHS243S0...

$45.44

Frequently Asked Questions

Does this Transformer fit my ICP RHS243S0CA0AAAA — 40VA Class 2 Control Power | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP RHS243S0CA0AAAA — 40VA Class 2 Control Power | 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 RHS243S0CA0AAAA — 40VA Class 2 Control Power | 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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