What are the specs for this Transformer?

The correct replacement for ICP model SUP18M2301CIA — L01H009 | 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 SUP18M2301CIA — L01H009 | Ships Today.

ICP

ICP 24VAC Relay Transformer for SUP18M2301CIA — L01H009 | Ships Today

Name: ICP 24VAC Relay Transformer for SUP18M2301CIA — L01H009 | Ships Today
Brand: ICP
SKU: L01H009-GEN
Price: 24.00 USD
Availability: InStock

SKU: L01H009-GEN Brand: ICP

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

Overview

This is the genuine ICP/Tempstar/Heil 24VAC control relay (OEM part L01H009, AG90-23242-024W) used in the low-voltage control circuit of the SUP18M2301CIA. The relay switches 24-volt signals from the thermostat and control board to energize the unit's higher-voltage loads such as the contactor coil and fan circuit. When this relay fails, the system loses the ability to reliably make or break those control connections — leading to a unit that will not start, will not stage properly, or that chatters and short-cycles. Replacing it with the correct OEM relay restores precise, dependable switching rated for the exact 24VAC coil voltage the equipment expects.

Specifications

Spec	Value
Part Number	L01H009 (AG90-23242-024W)
Type	Control Relay
Brand	ICP / Tempstar / Heil
Coil Voltage	24 VAC
Fit	OEM Replacement

Compatibility

Designed as a direct OEM-fit replacement for the ICP SUP18M2301CIA and other Tempstar/Heil/Comfortmaker units that share the same 24VAC control platform. Always confirm the printed part number on your existing relay before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
Access — Remove the unit's electrical service panel.
Document — Photograph all wire terminations before disconnecting.
Remove — Note coil and contact terminal positions, then unplug or unscrew the failed relay from its mounting clip or track.
Install — Seat the new relay, reconnect each lead to the matching terminal per your photo.
Test — Restore power and confirm the relay energizes on a call for cooling/heating.

Signs You Need a Replacement

Unit will not start even though the thermostat is calling.
Audible chatter, buzzing, or rapid clicking from the control area.
Intermittent operation or short-cycling.
Burned, pitted, or melted relay contacts on inspection.

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 24VAC Relay Transformer for ...

$24.00

Frequently Asked Questions

Does this Transformer fit my ICP SUP18M2301CIA — L01H009 | Ships Today?

Yes. This is the factory-specified OEM transformer for the ICP SUP18M2301CIA — L01H009 | 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 SUP18M2301CIA — L01H009 | 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.

Menu