Honeywell Furnace Thermocouple
Standard replacement for standing pilot gas systems.
$8 - $15
Check Price on Amazon →Quick Specs
- Brand
- Honeywell
- Category
- flame sensors
- Price Range
- $8 - $15
- ASIN
- B00RJF4PYQ
Overview
A 24-inch universal thermocouple from Honeywell for standing pilot gas systems. The thermocouple generates a small millivoltage from the pilot flame heat, which keeps the gas valve open. When it fails, the pilot stays lit but the burner won't fire, or the pilot goes out as soon as you release the reset button. This is the simplest gas appliance safety device and the easiest to replace.
Pros
- ✓ Universal 24-inch length fits most water heaters and older furnaces
- ✓ Honeywell quality — the standard in thermocouple manufacturing
- ✓ Simple push-connect fitting for fast installation
- ✓ Very affordable — usually under $15
Cons
- ✗ Only works with standing pilot systems — not electronic ignition
- ✗ 24-inch length may be too long for some compact applications
- ✗ Copper tube can kink if handled roughly during installation
Who It's For
Anyone with a standing pilot gas appliance where the pilot stays lit but the burner won't fire. If you can keep the pilot on by holding the reset button but it goes out as soon as you release, the thermocouple is bad. Replace it — 10 minutes, one wrench.
Who Should Skip This
Electronic ignition systems don't use thermocouples. Also skip if the pilot won't stay lit at all — that's a gas supply or pilot orifice issue, not the thermocouple.
Compatibility
Water heaters, boilers, and older furnaces with standing pilot ignition systems
Related Repair Guide
This part is referenced in our main repair guide:
View the full diagnostic guide on errorcodefixes.com →Bottom Line
The Honeywell universal thermocouple is the standard replacement part for standing pilot systems. At under $15 and 10 minutes to install, it's the easiest HVAC safety device to replace. Keep one in the house if you have a gas water heater.
Affiliate Disclosure: ErrorCodeFixes Reviews is a participant in the Amazon Services LLC Associates Program. We earn a commission on qualifying purchases made through our links. All reviews are based on manufacturer specifications, compatibility data, and research — not hands-on testing. Always verify compatibility with your specific equipment before purchasing.