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Tecmark Pressure Switch 4037P - Bubbles Supply

Tecmark Pressure Switch 4037P

Part #: 4037P

$39.23
In stock — ships today
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Also replaces

4037P
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this pressure switch

The Tecmark 4037P pressure switch is a critical safety component that monitors water pressure in spa systems, automatically shutting down equipment when pressure drops below safe levels. This heavy-duty 22-amp switch operates at 1-5 psi with a standard 1/8" NPT connection, making it compatible with a wide range of spa brands that use Tecmark 4000 series components.

Built to OEM specifications, this genuine Tecmark pressure switch resolves common spa issues including heater lockouts (HH), ice mode activation, and overheat conditions (OH) caused by low water flow. At Bubbles Supply, we guarantee this is the exact fit for your system and back it with our 1-year warranty. Most orders ship same day, getting your spa back online fast. Verify your existing switch's amperage rating and pressure range before installation to ensure proper system protection.

Exact part number

4037P

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 4037P
  • low-pressure cutoff switch
  • pressure switch 4037P
  • spa flow switch
  • Tecmark 4000 series pressure switch
  • Tecmark 4037P

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

Technical specifications

Amperage
22A
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:

  • Heater throws HH fault code and shuts down
  • Spa enters ice mode unexpectedly
  • OH (overheat) error with no actual temperature spike
  • Heater will not energize despite pump running
  • Spa control board cycles equipment on and off repeatedly
  • System faults on startup before reaching temperature

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

Before you buy — quick checklist

  • Confirm your existing switch is rated 22A — do not substitute a lower-amperage switch
  • Verify pressure range: this switch operates at 1–5 psi — confirm your system spec matches
  • Check your existing switch uses a 1/8" NPT port fitting before ordering
  • Confirm your current switch is a Tecmark 4000 series unit to ensure direct fit
  • Inspect the switch tubing and barb fitting for cracks or blockages before assuming the switch is the failure point

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

Install difficulty: Easy — DIY-friendlyTypically 15–30 minutes

What's in the box

  • Tecmark 4037P pressure switch
  • Spade terminals (pre-attached leads)

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

Warranty

1 year manufacturer 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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