The Wacker Neuson Thermocouple is a genuine OEM component designed for the HI 770 XHD and Arctic Bear HD series indirect air heaters. As a direct OEM replacement, this thermocouple meets the original design specifications set by Wacker Neuson, ensuring correct flame-sensing response in diesel and natural gas heater configurations across the HI 770 XHD and Arctic Bear HD model families. Verified fitment covers multiple machine configurations including 2x12, 1x16, and 1x20 duct arrangements. When your heater shuts down unexpectedly or fails to stay lit, the is the correct OEM part to restore normal operation.
Key Features
- Genuine OEM Flame Sensing Accuracy — Manufactured to Wacker Neuson's original thermocouple output specification, so the burner control circuit receives the precise millivolt signal needed to hold the gas valve open.
- Drop-In Replacement — Matches the original connector type and probe dimensions of the HI 770 XHD and Arctic Bear HD heater assemblies, allowing straightforward installation without modification.
- Broad HI 770 XHD and Arctic Bear Series Fitment — Confirmed for HI 770 XHD indirect air heaters across diesel and natural gas variants, as well as Arctic Bear HD and Arctic Bear XHD NS configurations.
- Restores Reliable Burner Operation — A failed thermocouple causes nuisance shutdowns or a burner that won't stay lit; replacing it with the correct OEM part returns the heater to consistent, uninterrupted heat output on cold-weather jobsites.
- Fuel System Safety Component — The thermocouple is a primary flame-safety device; using the correct OEM-rated part ensures the gas valve responds as designed and prevents unintended fuel flow if the flame is lost.
A thermocouple is a temperature-sensing safety device positioned in the burner flame of an indirect air heater. When the burner ignites, the flame heats the thermocouple's probe tip, generating a small millivolt signal that tells the gas valve to remain open and keep the burner running. If the thermocouple weakens or fails, that signal drops below the threshold required to hold the valve open, causing the heater to shut off and refuse to stay lit. Replacing a worn thermocouple with the correct OEM part — Wacker Neuson 5000166796 — restores proper flame-sensing function and allows the heater to operate safely and continuously in demanding cold-weather conditions.
Part Details
| Part Number | 5000166796 |
|---|---|
| Old Part Number | 0166796 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Thermocouple |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI 770 XHD Indirect Air Heater, Diesel, 2x12 | Arctic Bear XHD | 5000620676 |
| HI 770 XHD Indirect Air Heater, Diesel, 1x16 | HI770XHD | 5000620183, 5200003814, 5200004934, 5100049894 |
| HI770XHD Indirect Heater | Arctic Bear XHD NS | 5000620690 |
| Indirect Mobile Air Heater, Na tural Gas | Arctic Bear HD | 5000620199, 5000620197 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
