ICP 40VA Transformer for WFAR080B048B2 — 120V to 24V Control | Ships Today

Overview

This OEM 40VA control transformer (part number 1177217) supplies the low-voltage power for your ICP/Heil/Tempstar WFAR080B048B2 gas furnace. It steps the 120V line voltage down to the 24V used by the thermostat, control board, gas valve, and relays. When the transformer fails, the entire low-voltage control circuit goes dead — the furnace won't respond to the thermostat, the control board shows no power, and nothing energizes even though 120V is present. A transformer can fail from age, a shorted secondary circuit, or a blown internal fuse link, often producing a faint burnt-electrical smell.

Specifications

Compatibility

Designed for the ICP/Heil/Tempstar/Comfortmaker WFAR080B048B2 80,000 BTU gas furnace. This OEM 40VA transformer matches the factory primary/secondary voltages and mounting so it drops directly into the original location.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter before touching wiring.
2. Access — Remove the service panel to reach the control box and transformer.
3. Document — Photograph the primary (line) and secondary (24V) wiring before disconnecting.
4. Remove — Disconnect the primary and secondary leads, remove the mounting screws, and take out the failed transformer.
5. Install — Mount the new transformer, reconnect the 120V primary and 24V secondary leads per your photo, and confirm tight terminals.
6. Test — Restore power and verify 24V across the secondary, then confirm the furnace responds to a thermostat call.

Signs You Need a Replacement

• No 24V control power and the furnace ignores the thermostat.
• Control board is completely dead despite 120V at the furnace.
• Burnt-electrical smell or discoloration at the transformer.
• 0V measured across the secondary terminals with line power present.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.