Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
If your York furnace lights for a few seconds and then shuts right back off, the flame sensor is the usual suspect — and the right replacement is a fairly cheap part that takes minutes to swap. The catch that trips most people up is fitment: York used several different sensor rods over the years, and grabbing the wrong one means a part that will not mount or will not reach the burner flame. This guide covers seven sensors that all fit York-family furnaces, sorted by what each one actually suits, so you can match your existing part number and get heat back on.
This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
A flame sensor is a small metal rod that proves to the control board a burner has actually lit; if the signal drops, the gas valve closes for safety. Below you will find the practical differences between the seven picks, from sensing distance to terminal size. This comparison of the york furnace flame sensor options focuses on part-number fit and mounting so you buy once and get the heat back on.
Top Picks
How To Choose The Best York Furnace Flame Sensor
Start with the old part in your hand, not with a product page. Every York-family flame sensor is a metal rod on a ceramic insulator with a spade terminal on the end, and the differences that matter are the ones you can measure on the part you are replacing.
Match the part number before anything else
The seven-digit or eleven-character number printed on the old sensor or in your furnace manual is the single strongest guide. A sensor listed for S1-02530788700 is not automatically the same as one listed for S1-02535354000, even though both fit York cabinets. Cross-reference the number on the listing against the one on your part before you order.
Check sensing distance and rod length
A flame sensor has to sit in the burner flame without touching metal, so the distance from the mounting flange to the tip of the rod decides whether the part works. A rod with a 4.13-inch sensing distance occupies a very different spot in the burner box than one listed at 2 inches. If your replacement is a little long or short, the burner may not prove flame reliably.
Look at the terminal and bend style
Most sensors end in a male quick-connect spade — commonly 1/4 inch or 3/16 inch — and some rods carry a 90 degree bend to clear the burner assembly. The wire in your furnace pushes onto that spade, so a mismatched terminal size means either a loose connection or a squeeze with pliers. Match the terminal to your existing wire connector.
Decide between OEM and aftermarket
Genuine York parts carry the factory branding and part number, while aftermarket makers like Duralight and ClimaTek build direct replacements and often bundle a multi-year replacement policy. Both routes solve the same problem; the OEM path removes guesswork, and the aftermarket path often covers several part numbers in one sensor.
Side-by-Side Comparison
| Model | Best For | Sensing Distance | Terminal | Material | Amazon |
|---|---|---|---|---|---|
| York S1-025-27773-700★ Best Overall | Straightforward factory-brand swap | 2 inches | — | — | Amazon |
| Duralight S1-2702-311P (900-17)Most Cross-Referenced | Widest cross-reference coverage | — | 1/4 inch quick connect | Ceramic | Amazon |
| ClimaTek 025-30788-700 | Long-rod replacement on a budget | — | — | — | Amazon |
| Duralight S1-02530788700 (900-16) | Longer reach into the burner box | 4.13 inches | 3/16 inch quick connect | Stainless Steel | Amazon |
| ClimaTek S1-02535354000 | Direct-fit 025-35354-000 replacement | — | — | — | Amazon |
| OEM York S1-02535354000 | Factory-brand part with no cross-referencing | — | — | — | Amazon |
| York S1-2702-311P | Genuine OEM alternative for 2702-311P systems | — | — | — | Amazon |
Detailed Reviews
1. York S1-025-27773-700 Flame Sensor
Our pick — 4.5+★ from 300+ verified ratings; the strongest balance of quality and price.
The factory-branded rod that drops straight into a York burner box without a cross-reference chart.
It has the widest real-world track record of the group — 4.5+ stars across 300+ owners — and it earns the top spot because it proves flame and keeps the gas valve open. It is sold under the York brand itself and carries the 02527773700 part number, so if that string matches the sensor in your hand, you are buying the part the furnace was designed around.
The sensing distance is listed at 2 inches, which tells you the rod sits close to the mounting flange and reaches a short way into the burner flame. Mounting is a flange type, so the bracket screws down flat against the burner assembly the same way the original does. Every owner experience in the listing circles back to the same theme: it fixes the short-cycle problem, and the fit is right.
The honest catch is length. A fair number of buyers find this rod runs slightly longer than the original part it replaced, which can matter if your burner box is tight and the tip crowds the flame. Measure your old sensor tip-to-flange before ordering. For most York cabinets it lands correctly, and the fix takes effect the moment the furnace cycles again.
What earns the top spot
- York-brand part with the factory 02527773700 number on it, so fitment is easy to verify
- Flange mounting matches the factory bracket position
- Owners consistently report the furnace lighting and staying lit after the swap
Where it can trip you up
- Runs slightly longer than some original rods — check your burner box clearance
- Listed sensing distance of 2 inches is the shortest reach of the group
Go with this one if: your old sensor carries the 02527773700 part number and you want the factory part without a cross-reference chart.
Measure first if: your burner box is tight, since the rod can run longer than the original it replaces.
2. Furnace Flame Sensor S1-2702-311P
One part number covering York, Luxaire, Coleman, Evcon, Fraser/Johnson and Air Pro cabinets.
If you are not certain which badge is on your furnace, this Duralight sensor is the forgiving choice. It replaces S1-2702-311P, 2702-311P and 2702-311, and it is listed for York, Luxaire, Coleman, Coleman-Evcon, Fraser/Johnson and Air Pro systems. It also cross-references to a long list of Unitary Products Group model families, including BGD, BGM, BGU, FG8, G8C, GMB, GUB, L8C, MGP, ODF and UGB.
The shape is what separates it from the straight rods here. It uses a 90 degree bend with a 1/4 inch quick-connect terminal, so the wire comes onto the sensor from the side rather than straight off the end. From the mounting flange to the bend it measures 1-3/4 inch, and the ceramic insulator runs 1-1/2 inch. The ceramic body is the material that keeps the rod insulated from the burner chassis.
What buyers keep coming back to is straightforward: it fires the furnace and it goes in without drama. The bolt hole and the connector line up with the original part, which is what makes a swap in a tight cabinet tolerable. Duralight backs it with a two year limited replacement policy, so a dud sensor is less of a risk here than on an unbranded listing.
Who should lean this way: anyone whose manual lists S1-2702-311P or a 2702-311 number, and anyone running a Coleman, Evcon or Luxaire cabinet under the York family umbrella.
One thing to check: the 90 degree bend changes the wire routing, so confirm the spade terminal sits where your existing wire can reach.
Best when your part number matches the long list: this is the safest single sensor for a mixed York-family installation.
Look elsewhere if: your furnace needs a straight rod rather than a bent one.
3. ClimaTek Flame Sensor Rod 025-30788-700
A cheap direct-fit rod for the 025-30788-700 family that needs no drilling to seat.
ClimaTek built this rod to slot into York, Coleman and Luxaire furnaces that call for S1-02530788700, S1-02530788000, 025-30788-700 or 025-30788-000. The listing states it is a direct replacement that seats exactly, without drilling or other mounting changes. That matters in a burner box, because a sensor that does not thread onto the existing flange will not sit in the flame correctly.
It measures 1 x 7 x 5 inches packaged and weighs 0.704 ounces, making it the heavier of the two ClimaTek rods in this list — the other ClimaTek unit sits at 0.352 ounces. It is a relatively recent part, first listed in September 2024, so the long-term record is thinner than the older York-brand picks. It is also the most compact of the group in its packaged footprint.
This one is best for the buyer who has already found the exact part number and simply wants the lowest-cost route to a working flame sensor. Install is a matter of pulling the old wire off the spade and pushing it onto the new rod. If you are chasing a short-cycle fault and the cross-reference lines up, this is a clean, no-fuss option.
Value read: the lowest-cost direct-fit rod in this roundup, and it asks nothing of you beyond matching the part number and pushing on the wire connector.
Where the record is thinner: it arrived on the market in September 2024, so there are fewer owners behind it than the factory-branded picks.
Reach for this if: your furnace lists 025-30788-700 or S1-02530788700 and you want a direct-fit rod at the lowest cost.
Think twice if: you would rather lean on a longer-running part with more history behind it.
4. Furnace Flame Sensor S1-02530788700
A 4.13-inch stainless rod that reaches deeper into the burner flame than the short factory stub.
This Duralight sensor carries the longest sensing distance of the group at 4.13 inches — more than double the 2-inch reach of the York S1-025-27773-700 above. That extra length puts the rod tip further into the burner flame, which is what makes a sensor read reliably on a larger burner assembly. It replaces part numbers 025-30788-000, 025-30788-700 and S1-02530788700.
The build is stainless steel, so the rod resists the corrosion that builds on a sensor sitting in a flame. From the mounting flange to the end, it measures 4-1/8 inches, with a 1-3/4-inch exposed sensor end and a 3/16-inch male quick-connect terminal. The measuring range runs 1.125 to 4.125 inches. That terminal size is note, because it is smaller than the 1/4-inch terminal on the bent Duralight pick.
The listing also spells out the maintenance rule most furnace owners learn the hard way: clean the rod with steel wool or a Scotchbrite pad only. Sandpaper leaves grit that melts into the glass insulator and damages the sensor. Coverage is broad — York, Luxaire, Coleman, Coleman-Evcon, Fraser Johnson and Air Pro systems all appear on the compatibility list, and the Part is backed by a Duralight two year replacement warranty. Buyers report it putting a 14-year-old furnace back in service.
Why the long rod wins here
- 4.13-inch sensing distance reaches deeper into the burner flame than the short 2-inch rods
- Stainless steel rod stands up to flame-side corrosion
- The listing states the clean-with-steel-wool rule so you do not damage the glass
What to watch
- 3/16-inch terminal is smaller than the 1/4-inch spade on some other picks here
- The longer rod needs clearance in the burner box to sit correctly
Pick this for reach: if the original sensor was a longer rod and you want to replicate its position in the flame.
Confirm first: that your wire connector fits the smaller 3/16-inch terminal.
5. ClimaTek Flame Sensor Rod S1-02535354000
The lightest rod in the group, aimed straight at the 025-35354-000 part number.
If your old sensor carries 025-35354-000 or S1-02535354000, this ClimaTek rod is a direct swap that needs no drilling or bracket changes. It is the lighter of the two ClimaTek units at 0.352 ounces, versus the 0.704-ounce rod above — a difference that never matters once installed, but tells you it is a slim rod with a thinner section.
It shares the same 1 x 7 x 5 inch packaged footprint as the other ClimaTek sensor and the same York, Coleman and Luxaire fitment claim. Like its sibling, it launched in September 2024, so this is the newer-generation part rather than a long-running one. The install is the standard flame-sensor job: pull the spade off, unscrew the flange, and reverse the steps with the new rod.
For the York cabinet calling for the 02535354000 number, this is a clean budget-tier route. Read the part number on your old sensor carefully, because the numbering here changes by a few characters between the ClimaTek rods and the York OEM rod that follows. Match the number and the swap is a short, simple repair.
Straight swap for 025-35354-000 systems: the listing states exact fit without drilling, so the only real task is confirming your part number matches.
The trade-off: as a late-2024 part, it has a shorter track record than the factory-branded sensors here.
Buy this if: the part number on your sensor reads 025-35354-000 or S1-02535354000.
Skip only if: your number is different — then read the York OEM rod that covers that same family.
6. York Furnace Flame Sensor S1-02535354000
The factory-branded answer when you want zero guesswork on the 02535354000 part number.
This is the York-brand version of that same sensor, carrying the S1-02535354000 model number and the York name on the packaging. It mounts by flange, the same simple bracket approach used across this family. It is the heavier of the two sensors aimed at this number in terms of physical size, with a 6 x 6 x 6 inch packaged footprint — notably larger than the 1 x 7 x 5 inch footprint of the ClimaTek rods, which is largely down to the box packaging.
The listing is refreshingly clear about the failure it fixes: a bad flame sensor lets the furnace light for several seconds and then shut off on the flame sensor safety. That is the symptom pattern you will recognise, and the sensor is what stops it. It has fewer owners than the York S1-025-27773-700 pick but still holds 4.0+ stars across 20+ ratings.
For the buyer who wants the part number on the box to match the part number in the furnace manual exactly, this is that option. It matters less whether the box says ClimaTek or York if the sensor proves flame — but if you would rather eliminate any doubt with a branded part, this is the one that pairs with S1-02535354000.
What you are paying for: the York part number printed to match your manual, with a clear description of the short-cycle failure it remedies.
Smaller track record: fewer buyers behind it than the flagship York rod, which is worth knowing if you prefer the most-reviewed part.
Best for the exact-match buyer: anyone who wants the York name and S1-02535354000 printed on the part.
Look at the top pick if: you would rather buy the sensor with the deepest history behind it.
7. York S1-2702-311P Flame Sensor
York’s own sensor for the 2702-311P number, and a direct factory alternative to the Duralight pick.
York lists this as a genuine OEM replacement part with the S1-2702-311P model number, made in the United States. If your furnace manual specifies 2702-311P, this is the factory part for it, and it mirrors the fitment of the Duralight 900-17 above without the cross-reference step. It mounts by flange, and its 13.61 g weight makes it a compact, lightweight sensor that is easy to handle during the swap.
Where the Duralight version bundles a two year replacement policy and cross-references several Unitary Products Group families, this York part simply carries the factory name. That factory branding is the reassurance many buyers want, and it holds 4.5+ stars across 60+ ratings. The listing is spare on detail — it confirms the OEM origin, the model number and the country of origin, and not much else.
Treat this as the genuine-parts route to the 2702-311P number. It is a rod-and-flange part, and the install matches any sensor in this list. Compare the number on your old sensor one last time before you commit; a few characters separate this from the other York part numbers here.
The genuinely-York argument
- Genuine OEM York part with the S1-2702-311P model number
- Made in the United States, with flange mounting
- 4.5+ star read across a solid run of owners
What the listing leaves out
- Sparse details — no sensing distance or terminal size spelled out
- No bundled replacement policy like the aftermarket picks here
Choose this when genuine matters: the S1-2702-311P number and the York name together.
Consider the Duralight version if: you want a stated terminal size and a two year replacement policy on the same fitment.
Know the Specs
Sensing distance and rod length
Sensing distance is how far the rod reaches from the mounting flange to the flame, and it decides whether the sensor sits in the burner flame at all. The distance varies widely between parts, from 2 inches on the York S1-025-27773-700 to 4.13 inches on the Duralight 900-16. A mismatched length can leave the tip either out of the flame or crowding the burner, so always match it to your old sensor.
Quick-connect terminal size
The terminal is the metal spade at the end of the sensor that your furnace wire pushes onto. It commonly measures 1/4 inch or 3/16 inch, and the two are not interchangeable without a trim or a squeeze. Confirm the size on your existing wire before ordering so the connection seats firmly rather than sitting loose.
Rod material and insulation
The rod sits in a flame and the body around it insulates the rod from the burner chassis. Parts here are listed with a stainless steel rod or a ceramic body, and stainless steel resists flame-side corrosion over time. The ceramic section is what keeps the electrical signal clean, and it is also the part that grit from sandpaper can damage.
Cleaning a flame sensor
A dirty sensor is a common cause of short cycling, and the fix is gentle cleaning. The Duralight listing spells out the rule: use steel wool or a Scotchbrite pad, never sandpaper. Sandpaper leaves abrasive grit that melts into the glass insulator and damages the sensor, so a light rub with steel wool is the correct maintenance step.
Common Questions
How do I know which York flame sensor fits my furnace?
Will a flame sensor with a longer rod work in a shorter original slot?
What happens if I install the wrong flame sensor?
Can I just clean my old flame sensor instead of replacing it?
Is a genuine York flame sensor better than a Duralight or ClimaTek replacement?
Will a flame sensor for a Coleman or Luxaire furnace fit my York furnace?
How do I install a flame sensor safely?
Does the terminal size on the flame sensor matter?
Why does my furnace light and then shut off after a few seconds?
What does a two year replacement policy cover on these sensors?
The Bottom Line
For most York furnaces, the york furnace flame sensor to start with is the York S1-025-27773-700, because it is the factory-branded part with the deepest run of owners behind it at 4.5+ stars across 300+ buyers. If your furnace manual lists a 2702-311 number and you want the widest cross-reference coverage, the Duralight S1-2702-311P covers York, Coleman, Evcon and Luxaire in one sensor. And for a burner box that needs more reach into the flame, grab the Duralight S1-02530788700 with its 4.13-inch sensing distance. Match the number on your old rod first, and the swap is a short, cheap repair that ends the short cycling.
How we choose
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of November 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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