ICP 24V 40VA Control Transformer for RHS090H0BA0AAAA – Class II | Ships Today

Overview

This OEM 24-volt control transformer supplies low-voltage power to the control circuit of the ICP/Heil/Tempstar RHS090H0BA0AAAA heat pump. It steps line voltage down to 24V to drive the thermostat, contactor coil, reversing valve solenoid (OEM coils 1172619/1175367/1190263), and control relay (OEM 1178205). Rated 40VA, it provides the steady, regulated control power the system needs. When a transformer fails — usually from a shorted solenoid, overload, or burned winding — the unit goes completely dead with no thermostat response, even though line power is present.

Specifications

Compatibility

Direct-fit control transformer for the ICP/Heil/Tempstar/Comfortmaker RHS090H0BA0AAAA heat pump and comparable ICP-family units that use a 24V/40VA control circuit. Verify your existing transformer's primary voltage and 40VA rating before installing.

Installation Guide

1. Safety First – Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
2. Access – Remove the service panel to reach the control box.
3. Document – Photograph the primary and secondary wire connections before removing them.
4. Remove – Disconnect the line-voltage primary and 24V secondary leads, then unbolt the old transformer.
5. Install – Mount the new transformer and reconnect primary and secondary leads to match your photo.
6. Test – Restore power and verify 24V at the secondary and normal thermostat operation.

Signs You Need a Replacement

• System completely unresponsive with line power present
• No 24V reading at the transformer secondary
• Burning smell or visibly scorched transformer body
• Repeated control-fuse blowing after a shorted solenoid

Shipping & Returns

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