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PresAir Pressure Switch TNP411R-1.8PR - Bubbles Supply

PresAir Pressure Switch TNP411R-1.8PR

Part #: TNP411R-1.8PR

$56.84
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About this pressure switch

The PresAir TNP411R-1.8PR is a heavy-duty SPST pressure switch designed for spa and hot tub applications requiring precise 1.8 PSI activation. This 21-amp rated switch handles high electrical loads while providing reliable pressure sensing through its standard 1/8" NPT connection. Built to OEM specifications, it directly replaces failed pressure switches that trigger HH, ICE, or OH error codes on compatible spa control systems.

At Bubbles Supply, we guarantee this PresAir pressure switch delivers an exact fit for your spa's pressure sensing needs, backed by our comprehensive 1-year warranty and same-day shipping on in-stock orders. The robust SPST design ensures dependable switching action under demanding spa conditions. Professional installation recommended to ensure proper electrical connections and pressure line routing – always verify your spa's electrical requirements and pressure specifications before installation.

Exact part number

TNP411R-1.8PR

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Also known as / Replaces

This part replaces or is interchangeable with:

  • PresAir 1.8 PSI SPST switch
  • spa pressure switch 1.8PR
  • TNP411R 1.8 PSI pressure switch

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Amperage
21A
Port type
1/8" NPT

Plumbing notes

  • Port type: 1/8" NPT

Need help measuring? Email hello@bubblessupply.com with a photo of your existing plumbing.

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • HH error code on spa display
  • ICE error code on spa display
  • OH error code on spa display
  • Spa shuts down unexpectedly under normal operating conditions
  • Heater fails to activate despite adequate water flow
  • Spa control board not receiving pressure signal

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your existing pressure switch is rated for 1.8 PSI activation — using the wrong trip point will cause nuisance shutdowns or missed fault detection
  • Verify the port connection on your spa's pressure line is 1/8" NPT before ordering
  • Check that your control system requires an SPST (single-pole, single-throw) switch — SPDT switches are not interchangeable
  • Confirm your spa's circuit amperage does not exceed 21A continuous load through the switch
  • Note the error codes your spa is throwing — HH, ICE, and OH codes are the primary indicators of a failed pressure switch, but rule out flow and temperature sensor issues first

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium — Some experience neededTypically 30–60 minutes

What's in the box

  • PresAir TNP411R-1.8PR pressure switch
  • Mounting hardware (if included by manufacturer)

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

Warranty

1 year warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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