ICP Outdoor Thermostat for ZAXB050HPB1 — Honeywell T6031H 24V Heat Pump Stage Control | Ships Today
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Overview
This is a genuine OEM outdoor thermostat (ICP part number 1054570, "TSTAT OD T6031H X") built on the Honeywell T6031H temperature controller. In a heat pump system like the ICP ZAXB050HPB1, the outdoor thermostat senses ambient outdoor air temperature and locks out or stages supplemental electric/gas backup heat. This protects efficiency by preventing auxiliary heat from running when the heat pump alone can satisfy demand, and enabling backup heat only when outdoor temperatures fall below the setpoint. The T6031H is a SPDT remote-bulb control operating on the 24V control circuit. Common failure symptoms include backup heat that never engages on cold days, backup heat that runs constantly (high electric bills), erratic staging, or contacts that fail to switch when the bulb temperature crosses setpoint.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1054570 |
| Description | TSTAT OD T6031H X (Outdoor Thermostat) |
| Base Control | Honeywell T6031H |
| Type | Outdoor / remote-bulb temperature controller |
| Switch Action | SPDT |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Control Voltage | 24V |
| Application | Heat pump supplemental heat staging / lockout |
Compatibility
Directly fits the ICP/Tempstar/Heil ZAXB050HPB1 heat pump and other ZAXB-series units that use OEM part 1054570. As a Honeywell T6031H-based outdoor thermostat, it is also used across many heat pump platforms for outdoor staging and backup-heat lockout. Always confirm your existing control carries part number 1054570 or the T6031H designation before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker. Verify zero voltage at the 24V terminals with a multimeter before touching wiring.
- Access — Remove the outdoor unit's control/access panel to reach the thermostat mounting location.
- Document — Photograph all wire connections and the remote bulb routing before disconnecting anything.
- Remove — Label and disconnect the 24V leads, unclip the sensing bulb from its capillary mount, and remove the old controller from its bracket.
- Install — Mount the new T6031H, route and secure the remote bulb in the original sensing location, and reconnect the 24V leads per your photo.
- Test — Set the desired outdoor lockout/stage setpoint, restore power, and verify backup heat energizes and de-energizes as outdoor temperature crosses the setpoint.
Signs You Need a Replacement
- Backup/auxiliary heat never turns on even in very cold weather
- Backup heat runs constantly, driving up electric bills
- Contacts fail to switch when the sensing bulb crosses setpoint
- Erratic or no staging of supplemental heat
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