What are the specs for this Transformer?

The correct replacement for ICP model RGS243HREA0AAAA — 120/24 Volt | 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 RGS243HREA0AAAA — 120/24 Volt | Ships Today.

ICP

ICP Transformer 40VA 24V for RGS243HREA0AAAA — 120/24 Volt | Ships Today

Name: ICP Transformer 40VA 24V for RGS243HREA0AAAA — 120/24 Volt | Ships Today
Brand: ICP
SKU: 1183814
Price: 35.04 USD
Availability: InStock

SKU: 1183814 Brand: ICP

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Overview

This OEM control transformer supplies the low-voltage 24V power that runs the thermostat, gas valve, relays, and control circuit on your ICP Tempstar Heil RGS243HREA0AAAA gas furnace. It steps the incoming 120V line voltage down to 24V at 40VA. When a transformer fails, the entire low-voltage control system goes dead: the thermostat screen blanks, the furnace will not respond to a call for heat, and you may smell burnt insulation or find a tripped internal fuse. This direct-fit replacement restores reliable control power and works with the OEM relays (part numbers 1183814 24V DPDT and 1178205 24V DPST) used in this model's control sequence.

Specifications

Spec	Value
OEM Part Numbers	1183814, 1178205
Type	Control Transformer
Brand	ICP (Tempstar / Heil)
Primary Voltage	120V
Secondary Voltage	24V
Rating	40 VA

Compatibility

Engineered for the ICP Tempstar Heil RGS243HREA0AAAA gas furnace and its companion RGS243-series control assemblies. Confirm your existing transformer's VA and voltage ratings before ordering.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
Access — Remove the furnace blower/control compartment service panel.
Document — Photograph all primary and secondary wire connections before disconnecting.
Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the transformer from the control bracket.
Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo.
Test — Restore power and confirm 24V at the secondary and a normal call for heat.

Signs You Need a Replacement

Thermostat is blank or unpowered
No 24V reading at the secondary terminals
Furnace will not respond to a heat call
Burnt smell or repeatedly blown control fuse

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 24V for RGS...

$35.04

Frequently Asked Questions

Does this Transformer fit my ICP RGS243HREA0AAAA — 120/24 Volt | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP RGS243HREA0AAAA — 120/24 Volt | 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 RGS243HREA0AAAA — 120/24 Volt | 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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