What are the specs for this Transformer?

The correct replacement for ICP model RGS303HSAA0AAAA – OEM Furnace 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 RGS303HSAA0AAAA – OEM Furnace Control Transformer | Ships Today.

ICP

ICP 40VA 24V Transformer for RGS303HSAA0AAAA – OEM Furnace Control Transformer | Ships Today

Name: ICP 40VA 24V Transformer for RGS303HSAA0AAAA – OEM Furnace Control Transformer | Ships Today
Brand: ICP
SKU: 1183814-GEN
Price: 29.95 USD
Availability: InStock

SKU: 1183814-GEN Brand: ICP

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Overview

This OEM control transformer is the 24V power source for the ICP / Tempstar / Heil RGS303HSAA0AAAA gas furnace control circuit. It steps 120V line voltage down to the 24V needed by the control board, thermostat, gas valve, and 24V relays such as OEM parts 1183814 (24V DPDT, T92S11A22-24) and 1178205 (24V DPST, T92P7A22-24). A failed transformer leaves the entire low-voltage control system dead. Common failure causes include shorted thermostat wiring, a seized inducer or blower drawing excess current, or simple age-related winding burnout. Typical symptoms are a blown control fuse, no 24V at the board, a non-responsive thermostat, or a faint burnt-electrical odor near the transformer.

Specifications

Spec	Value
Type	Control Transformer
Brand	ICP (Tempstar / Heil)
Primary Voltage	120V
Secondary Voltage	24V
Rating	40 VA
Associated 24V Relays	1183814 (DPDT), 1178205 (DPST)
Application	Furnace Low-Voltage Control Circuit
Fitment	OEM Direct Replacement

Compatibility

Built for the ICP / Tempstar / Heil RGS303HSAA0AAAA gas furnace and related models using the same 24V control circuit and relay set. Confirm primary/secondary voltage and VA rating against your existing transformer before installing.

Installation Guide

Safety First – Disconnect power at the switch and breaker; verify zero voltage with a multimeter.
Access – Remove the furnace control-compartment service panel.
Document – Photograph the primary and secondary lead connections before disconnecting.
Remove – Disconnect the leads, remove the mounting screws, and take out the old transformer.
Install – Mount the new transformer, reconnect the 120V primary and 24V secondary leads per your photo.
Test – Restore power and confirm 24V at the secondary and normal control operation.

Signs You Need a Replacement

No 24V output and a completely dead control circuit.
Repeatedly blown low-voltage control fuse.
Thermostat and control board unresponsive despite 120V line power.
Burnt smell, discoloration, or audible buzzing from the 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 40VA 24V Transformer for RGS...

$29.95

Frequently Asked Questions

Does this Transformer fit my ICP RGS303HSAA0AAAA – OEM Furnace Control Transformer | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP RGS303HSAA0AAAA – OEM Furnace 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 RGS303HSAA0AAAA – OEM Furnace 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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