ICP Outdoor Thermostat for ZAXB020EPC1 – Honeywell T6031H | Ships Today

Overview

This is a genuine OEM outdoor thermostat (part number 1054570, Honeywell T6031H) for the ICP/Tempstar/Heil ZAXB020EPC1 heat pump system. The outdoor thermostat is a remote-bulb temperature control that senses outdoor ambient temperature and locks out auxiliary or supplemental electric heat strips until the air gets cold enough to justify the added energy use. By staging backup heat based on a precise temperature setpoint, it protects efficiency and prevents the heat pump from running expensive resistance heat during mild weather. When this control fails, the most common symptoms are auxiliary heat running constantly (high electric bills), backup heat never engaging on cold days, or erratic staging. The T6031H uses a capillary tube and sensing bulb for accurate, drift-free readings.

Specifications

Compatibility

This thermostat is the factory-specified outdoor control for the ICP ZAXB020EPC1 and is shared across many ICP, Tempstar, Heil, and Comfortmaker heat pump packaged and split systems that use Honeywell T6031H staging. Always confirm against your unit's parts list before ordering.

Installation Guide

1. Safety First – Disconnect power at the disconnect and breaker. Verify zero voltage at the control terminals with a multimeter before touching wiring.
2. Access – Remove the control-access service panel on the outdoor unit.
3. Document – Photograph all wire connections and the routing of the sensing bulb before disconnecting anything.
4. Remove – Label and disconnect the thermostat leads, unclip the capillary sensing bulb from its mounting, and remove the old control body.
5. Install – Mount the new T6031H, route and secure the capillary bulb in the same location (do not kink the tube), and reconnect the wiring per your photo.
6. Test – Restore power, set the desired lockout setpoint, and verify auxiliary heat stages correctly with outdoor temperature.

Signs You Need a Replacement

• Auxiliary/electric backup heat runs even in mild weather, spiking electric bills
• Supplemental heat never engages on the coldest days
• Erratic or random staging of the heat strips
• Visible damage to the capillary tube or sensing bulb, or a corroded control body

Shipping & Returns

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