ICP Thermostat for RYB029GAA — OEM 1526859 3AAT82B35A2 | Ships Today

Overview

This OEM thermostat / temperature control (ICP part number 1526859, ARCO type 3AAT82B35A2) provides the temperature-sensing and switching function for the RYB029GAA system. It monitors temperature and opens or closes the 24V control circuit to call for heating or cooling, ensuring the equipment cycles at the correct setpoints. A failed control can cause the system to never call for operation, to run without ever satisfying, or to cycle erratically at the wrong temperatures. Installing the genuine OEM 1526859 control restores accurate, factory-specified switching behavior.

Specifications

Compatibility

Direct OEM fit for the ICP / Tempstar / Heil RYB029GAA system using the 1526859 (3AAT82B35A2) control. Match the printed part number on your existing control before ordering to confirm fitment.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the service panel to reach the control.
3. Document — Photograph all wiring before disconnecting any leads.
4. Remove — Disconnect the control leads and detach the old thermostat from its bracket or clip.
5. Install — Mount the new control and reconnect each lead exactly per your photo.
6. Test — Restore power and verify the system calls for and satisfies heating/cooling at the correct setpoints.

Signs You Need a Replacement

• System never calls for heating or cooling
• Equipment runs continuously and never satisfies
• Erratic cycling at incorrect temperatures
• No continuity across the control when tested with a meter

Shipping & Returns

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