Thermocouple | Q340A1074/U
About this product
Thermocouple — manufacturer part number Q340A1074/U.
What this part does
The thermocouple sits in the standing pilot flame and generates a small voltage that holds the gas valve's safety open. When it weakens, the valve can no longer stay open and the pilot drops out as soon as you release the button.
Replace this part if
- Pilot lights but goes out when you release the control knob
- Pilot will not stay lit at all
- Pilot burns yellow or weak rather than blue
- Thermocouple tip is corroded, sooty, or pitted
- No heat despite a lit pilot
Specifications
| Manufacturer Part Number | Q340A1074/U |
|---|---|
| Condition | New |
| Sold By | Furnace Direct (Hamlin Mechanical LLC, MN Lic. #128688) |
Install difficulty
Easy — about 20 minutes. Tools: Adjustable wrench, 3/8" wrench. Power off at the breaker: yes. Gas shutoff required: no.
Typical service life is 3-6 years. Most HVAC companies charge $150-250 to replace this part, including the service call.
Frequently asked questions
How do I know if my thermocouple is bad?
Replace it if you see any of these: pilot lights but goes out when you release the control knob; pilot will not stay lit at all; pilot burns yellow or weak rather than blue.
Can I replace a thermocouple myself?
Yes. This is a easy repair that takes about 20 minutes with adjustable wrench, 3/8" wrench. Always shut the power off at the breaker first.
How long does a thermocouple last?
Typically 3-6 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.
How much does a contractor charge to replace a thermocouple?
Most HVAC companies charge $150-250 for this repair, including the service call. The part itself is $36.95.
How fast does this ship?
Orders placed by 2 PM CT typically ship the same business day, with delivery in 1-5 business days.
What if it does not fit?
Return it within 90 days. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.
Sold by licensed HVAC contractors. Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.
Specifications
| Brand | Furnace Direct |
| Serial Number | Q340A1074/U |
| Type | HVAC Replacement Part |
| Warranty | 10-Year Manufacturer (Parts) |
| Shipping | Free pallet freight |
What customers are saying
Saved $2,400 vs local contractor
Got quoted $9,200 from a local HVAC contractor for a furnace replacement. Found Furnace Direct and got the exact same Goodman unit for under $5k delivered. My installer couldn't believe the price and installed it in one day. Runs perfectly.
Fast shipping, exactly as described
Ordered on a Tuesday, pallet arrived Friday. Unit was packed well, no damage, all factory sealed. Andrew answered my sizing question over the phone and got me the right model. Couldn't be happier with the purchase.
Installer said same one he'd buy at supply house
My HVAC guy said he pays basically the same price at his wholesale supply house. The markup contractors add is insane. Furnace Direct cut the middleman out entirely. Will recommend to everyone I know.
Heating my 2,200 sq ft home perfectly
Installed my 96% AFUE furnace a couple months ago. Heats my 2,200 sq ft home perfectly, and my gas bill dropped noticeably compared to the old unit. Great product, great price, great experience from start to finish.
Saved enough to pay for the install
Math was simple: 3 contractor quotes all over $8k. Furnace Direct plus local installer was under $5,500 total. Saved enough to basically pay for the install myself. Quality is identical to what contractors charge a fortune for.
No-pressure, honest pricing
Called a few HVAC companies first — every single one wanted to schedule an "in-home consultation" before giving me a price. Furnace Direct just showed me the price. Bought online, shipped next day, done. This is how it should work.
Questions About This System?
Send a few photos of your current setup and we'll get you a real quote — and let us know if you need installation or just want the unit shipped same-day.
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