What are the specs for this Transformer?

The correct replacement for ICP model RGS300HDAA0AAAA — 120/24V | 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 RGS300HDAA0AAAA — 120/24V | Ships Today.

ICP

ICP 40VA Control Transformer for RGS300HDAA0AAAA — 120/24V | Ships Today

Name: ICP 40VA Control Transformer for RGS300HDAA0AAAA — 120/24V | Ships Today
Brand: ICP
SKU: 1183814-GEN
Price: 34.00 USD
Availability: InStock

SKU: 1183814-GEN Brand: ICP

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Overview

This OEM control transformer steps the 120V line voltage of the ICP/Heil/Tempstar RGS300HDAA0AAAA furnace down to the 24V needed by the control board, gas valve, thermostat, and relays. Rated at 40VA, it supplies the low-voltage control circuit that runs the entire safety and ignition sequence. A failed transformer is one of the most common no-heat causes: when it opens or shorts, the furnace gets no 24V control power and nothing energizes. Note: this listing covers the 24V control circuit for this model — verify your exact OEM part number, as the associated relays (1183814, 1178205) carry the same 24V coil rating.

Specifications

Spec	Value
Type	Control Transformer
Brand	ICP / Heil / Tempstar
Primary Voltage	120V
Secondary Voltage	24V
Rating	40VA
Related Relays	1183814 (DPDT 24V), 1178205 (DPST 24V)
Fits Model	RGS300HDAA0AAAA

Compatibility

Fits the ICP/Heil/Tempstar RGS300HDAA0AAAA gas furnace and other RGS-series units using a 120/24V 40VA control transformer. Confirm primary/secondary voltage and VA rating against your existing transformer before installing.

Installation Guide

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

Signs You Need a Replacement

No 24V control power — thermostat and board are dead
Furnace will not start despite a valid heat call
Blown low-voltage fuse that fails again immediately
Burnt smell or visible scorching at the transformer

Shipping & Returns

Ships same day on orders placed 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 Control Transformer for...

$34.00

Frequently Asked Questions

Does this Transformer fit my ICP RGS300HDAA0AAAA — 120/24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP RGS300HDAA0AAAA — 120/24V | 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 RGS300HDAA0AAAA — 120/24V | 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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