ICP Transformer for SH15018B — 120V to 24V 40VA | Ships Today
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Overview
This OEM control transformer (part number 1540352) steps down 120-volt line power to the 24-volt low-voltage control circuit used by your ICP SH15018B furnace. Rated at 40VA, it supplies the thermostat, gas valve, control board, blower relay, and other 24V components. When a transformer fails, the entire low-voltage control system goes dead: the thermostat screen blanks, the furnace will not respond to a heat or cool call, and you may smell burnt insulation or find a tripped low-voltage fuse. A 40VA rating provides adequate headroom for standard residential control loads while protecting against overload.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1540352 |
| Type | Control / Class 2 Transformer |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Rating | 40VA |
| Primary Voltage | 120V |
| Secondary Voltage | 24V |
| Fit | OEM Replacement |
Compatibility
Designed as a direct-fit replacement for the ICP SH15018B and other Tempstar, Heil, and Comfortmaker models that originally shipped with OEM part 1540352. Always confirm your existing transformer is a 120V-to-24V, 40VA unit before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter at the transformer primary leads.
- Access — Remove the furnace blower/control compartment service panel.
- Document — Photograph all primary (120V) and secondary (24V) wire connections before disconnecting.
- Remove — Disconnect the line and load wires, then unbolt the transformer from its mounting bracket or control panel.
- Install — Mount the new transformer, reconnect the 120V primary and 24V secondary leads exactly per your photo.
- Test — Restore power and confirm 24V across the secondary terminals and normal thermostat operation.
Signs You Need a Replacement
- Thermostat is blank or unresponsive with line power present
- Furnace ignores heat/cool calls and no 24V is measured at the control board
- Repeatedly blown low-voltage fuse or burnt smell from the control area
- No or low secondary voltage measured across the transformer output
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