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.
Your furnace starts, runs a few seconds, then shuts down and tries again — that on-off loop is usually a pressure switch telling the control board the draft is wrong. The right York replacement switch matches the part number on your old unit and gets the burners firing again. Below are three OEM-style replacements for York furnaces, sorted by what each one actually is and which furnace family it fits.
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.
Three York-compatible replacement switches, three different actuator designs, and one clear order of preference for most homeowners. The short answer: match your existing part number first, then buy the switch built to match it, and that logic is exactly how this list of the york furnace pressure switch options was ranked.
Top Picks
How To Choose The Best York Furnace Pressure Switch
A pressure switch is a safety part, not a performance upgrade. It watches the draft in your furnace’s flue and only lets the burners fire when the airflow is right. Buy the wrong one and your furnace either refuses to start or short-cycles every few minutes. So the choice is never about which switch is “better” in the abstract — it is about which one matches the part you are pulling out.
Start with the part number on the old switch
The single most reliable move is to read the number stamped on the switch you are replacing. Manufacturer part numbers for these units run long, like S1-02435780000 on the S1-02435780000 switch or S1-02435776000 on the 0.45″ WC replacement. Matching that sequence is worth more than any spec comparison, because the control board is looking for a specific open-or-closed signal at a specific pressure.
Then check the actuator design
Two switches can look identical from the outside and still behave differently inside. The JNAB unit uses a piston actuator — a small sliding plunger that moves when pressure builds. The S1-02435780000 uses a diaphragm actuator, which is a flexible membrane that flexes instead. These are different mechanisms, and you should replace like with like rather than swapping one design for the other.
Confirm the contact type before you order
Contact type describes what the switch does when there is no pressure on it. Normally Closed means the circuit is complete at rest and opens when pressure arrives. Normally Open means the opposite. The JNAB switch is Normally Closed and the S1-02435780000 is Normally Open, so these two are not a casual swap for each other. Get this wrong and the furnace will not sequence correctly.
Know what IP00 does and does not promise
Both the JNAB switch and the S1-02435780000 carry an IP00 protection rating, which in plain terms means no protection against dust or water ingress is claimed. That is normal for a part that lives inside a sealed furnace cabinet, but it also means you should not mount one in a damp or exposed spot. Treat IP00 as “indoor furnace cabinet only.”
Side-by-Side Comparison
| Model | Best For | Actuator Type | Contact Type | Circuit Type | Amazon |
|---|---|---|---|---|---|
| JNAB York OEM Furnace Replacement Pressure Switch★ Best Overall | Matching an existing piston-actuator, normally closed part | Piston | Normally Closed | 1-way | Amazon |
| S1-02435780000 York OEM Replacement Air Pressure Switch | Matching an existing diaphragm-actuator, normally open part | Diaphragm | Normally Open | 1-way | Amazon |
| York Furnace Air Pressure Switch Replacement For Part # S1-02435776000 | Replacing a 0.45″ WC rated switch on that part number | — | — | — | Amazon |
Detailed Reviews
1. JNAB York Furnace Pressure Switch
Our pick — 4.0+★ from 100+ verified ratings; the strongest balance of quality and price.
The piston-actuator, normally closed switch with the deepest owner track record of the three.
If your furnace is short-cycling and the old switch has a piston-style plunger inside, this is the one to reach for. It is an OEM replacement air pressure switch built for York furnaces, and it is the pick here with by far the most owner experience behind it — 4.0+ stars across 120+ ratings, which for a niche HVAC part is a deep track record.
This switch uses a piston actuator, so a small plunger slides as pressure builds in the flue, and its contacts are Normally Closed, meaning the circuit sits complete until pressure opens it. It connects through a screw terminal, and the terminals are copper with a 1-way circuit. In plain terms: strip your leads, land them on the screw terminals, and it behaves the way your control board expects.
Owner reviews here focus on one thing: whether the switch works once it is installed, and the feedback lands firmly on yes. Most of the conversation around this part centers on whether it functions correctly once installed, and the owner feedback lands firmly on yes. Screw terminals and a 1-way circuit mean you land your existing leads and nothing else changes.
The honest trade-off is that the design is fixed. If your old unit is a diaphragm type with normally open contacts, this piston, normally closed part is the wrong animal entirely — it is a matched replacement, not a universal one. Also note the IP00 rating: no claimed protection from dust or moisture, so it belongs inside the furnace cabinet only.
Where it earns its keep
- Piston actuator and Normally Closed contacts match the furnace family it is built for
- Copper screw terminals make for a straightforward wire-and-land install
- The deepest owner track record of the three picks
Where it stops
- Not interchangeable with a diaphragm or normally open switch
- IP00 means zero abrasion or moisture protection claimed
Reach for this if: your existing switch is a piston type with normally closed contacts and you want the option most York owners have already lived with.
Look elsewhere if: the label on your old part says diaphragm or normally open — the S1-02435780000 below is the match.
2. S1-02435780000 York Air Pressure Switch
A diaphragm inside instead of a piston — and the exact part number stamped on the box.
Here is the switch to pick when the dead unit in your hand is stamped S1-02435780000. It is a brand new OEM replacement air pressure switch for York furnaces, and it carries the strongest owner score in this group at 4.5+ out of 5. The rating count is thinner than the JNAB above — 20+ ratings against 120+ — but the satisfaction level is the highest here.
Where the JNAB uses a piston, this one uses a diaphragm actuator — a flexible membrane that flexes with flue pressure rather than a sliding plunger. Its contacts are Normally Open, so the circuit sits broken at rest and closes once pressure arrives. That is the opposite contact logic from the JNAB switch, which is precisely why you match the old part rather than picking by score. Screw terminals, copper contacts, a 1-way circuit, and the same IP00 rating round out the spec sheet.
The listing names residential use as the compatible application, confirming this is a furnace part rather than an automotive one. It also lists 1-way circuit and automatic control, so once it is wired in, it does its job with no dials to fiddle with. The wire-and-land installation is the same screw-terminal routine as the other genuine York replacements.
Why it takes the top score: a diaphragm actuator with normally open contacts is a narrower specialty part, and the buyers who need exactly that have rated it the highest of the three. It is a narrow specialty part, and the buyers who needed exactly that rated it highest of the three.
The thing to weigh: the IP00 rating carries the same meaning here — no dust or water protection is claimed — and the thinner rating base means you are trusting a smaller sample than the JNAB gives you.
Your move: confirm S1-02435780000 is on your old switch, then order this one without second-guessing the lower rating count.
Not your part: if your old unit is a piston type with closed contacts, the JNAB above is the correct swap.
3. York Air Pressure Switch S1-02435776000
The part-number specialist: built for S1-02435776000 and nothing else claimed.
Notice the number closely. This replacement is for part # S1-02435776000 — one digit group different from the S1-02435780000 switch above. In pressure switch territory that gap is enormous, which is why this one exists as its own pick rather than a substitute. It has held a 4.5+ star rating across 20+ ratings, so it sits between the other two on owner satisfaction.
The listing is refreshingly narrow: a new furnace air switch, rated 0.45″ WC. That figure is inches of water column, the draft pressure the switch is set to respond to — think of it as how hard the flue has to pull before the switch reports the draft is good. If the number on your old switch reads 0.45″ WC on this part number, this is the direct match.
It has been listed since September 16, 2015, which is a long, steady presence for a small HVAC part rather than a flash listing that vanishes. Manufacturer is listed as a replacement for York. Listing photography is straightforward, and there is no inflated claim about universal fit anywhere on the page — which is the right tone for a component this specific.
What the spec sheet tells you: a 0.45″ WC setpoint tied to the S1-02435776000 part number, and nothing beyond that promised. If you matched the digits on your old switch, that narrow fit is exactly what you want.
The catch: the listing does not spell out actuator type or contact type the way the other two do. If you need certainty on those specifics before ordering, that detail gap is worth knowing about, and it means you should lean on a part-number match here rather than a spec comparison.
Buy this when: the old switch reads S1-02435776000 and 0.45″ WC, and you want a part with a decade-long listing history behind it.
Step back if: your old part number ends differently or you need the contact type spelled out before you commit.
Know the Specs
Actuator Type: Piston vs Diaphragm
The actuator is the moving part that senses pressure. A piston actuator uses a small sliding plunger, and a diaphragm actuator uses a flexible membrane that flexes instead. They are not swappable on a whim — match the type already in your furnace. The JNAB switch uses a piston, and the S1-02435780000 uses a diaphragm.
Contact Type: Normally Open vs Normally Closed
Contact type describes the switch’s resting state with no pressure applied. Normally Closed means the circuit is complete at rest and opens when pressure arrives; Normally Open means the circuit is broken at rest and closes under pressure. Your control board expects one or the other, so this is a confirmation step, not a preference.
WC Rating (Inches of Water Column)
WC stands for inches of water column — a way of measuring very low pressure. A 0.45″ WC rating tells you the draft pressure the switch responds to. It is the number to match against the marking on your existing switch rather than a figure to shop for a higher or lower value.
IP Rating: What IP00 Actually Means
An IP rating grades how well a part resists dust and water. IP00 is the bottom of that scale: no protection against either is claimed. That is expected for a component that lives inside a sealed furnace cabinet, but it tells you not to mount one in a damp basement corner or an exposed spot.
Common Questions
How do I know which York furnace pressure switch to order?
Can I swap a piston actuator switch for a diaphragm one?
What does Normally Open mean on a furnace pressure switch?
What does the 0.45″ WC rating on the S1-02435776000 switch mean?
Does an IP00 rating mean the switch is sealed?
Will a pressure switch fix a furnace that starts and then shuts off?
Is the JNAB switch a genuine York part?
How long has the S1-02435776000 replacement been sold?
Do I need to match both the part number and the WC rating?
What are the screw terminals for on these switches?
The Bottom Line
For most people replacing a failed York furnace pressure switch, the JNAB York OEM Furnace Replacement Pressure Switch is the safe starting point — it is the piston-actuator, normally closed design with the longest owner track record of the three, and that depth of experience counts when you are buying a safety part you will not test until the cold arrives. If the number on your old switch is S1-02435780000, take that one instead; it holds the highest owner score in the group at 4.5+ and its diaphragm, normally open design is a different mechanism entirely. And if you are matching S1-02435776000 with its 0.45″ WC marking, the part-number-specific replacement is the only honest answer. Match the stamped part number first, then confirm actuator and contact type before you order.
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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