ICP Transformer for RHS090L0AA0AAAA — 40VA 24V Control | Ships Today
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Overview
This is a genuine OEM 40VA control transformer for the ICP (International Comfort Products) RHS090L0AA0AAAA heat pump system. The transformer steps line voltage (208/240V primary) down to the 24V secondary that powers your thermostat, control board, contactor coil, reversing-valve solenoid, and relays — including the associated 24V components on this unit such as the reversing valve coil and DPST relay. When a transformer fails, the entire low-voltage control circuit goes dead: the thermostat screen blanks, the contactor won't pull in, and nothing responds to a heating or cooling call. Failures are usually caused by a shorted thermostat wire, a stuck contactor drawing excess coil current, or simple age-related winding breakdown. Installing a properly rated 40VA transformer restores full control power and protects downstream components.
Specifications
| Spec | Value |
|---|---|
| Type | Control / Step-Down Transformer |
| Brand | ICP / Tempstar / Heil / Comfortmaker |
| Rating | 40 VA |
| Primary Voltage | 208 / 240V |
| Secondary Voltage | 24V |
| Related 24V Parts | 1172619, 1178205, 1175367, 1190263 |
Compatibility
Built for the ICP RHS090L0AA0AAAA heat pump and used across many ICP-family systems sold under the Tempstar, Heil, Comfortmaker, and Arcoaire brands. Confirm your primary voltage (208/240V) and VA rating before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the service/control panel to reach the transformer.
- Document — Photograph all primary and secondary leads before disconnecting.
- Remove — Disconnect the primary (line) and secondary (24V) wires and unbolt the old transformer from its bracket.
- Install — Mount the new transformer and reconnect primary and secondary leads exactly per your photo.
- Test — Restore power and confirm 24V at the secondary and that the thermostat and controls power up.
Signs You Need a Replacement
- Blank thermostat and no response to heating or cooling calls.
- No measurable 24V at the secondary terminals.
- Contactor and reversing valve won't energize.
- Burnt smell or visibly scorched transformer housing.
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