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IQ2020 Temperature Sensor 34-39530-K - Bubbles Supply
Exact Fit

IQ2020 Temperature Sensor 34-39530-K

Part #: 34-39530-K

$84.39
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this sensor

The IQ2020 Temperature Sensor 34-39530-K is an OEM replacement part designed for Hot Spring Spas control systems. This genuine Watkins temperature sensor features a 5/8" threading and includes the necessary O-ring seal for proper installation and watertight operation.

Built to Hot Spring's exact specifications, this sensor ensures accurate temperature readings for your spa's heating system. At Bubbles Supply, we guarantee an exact fit for your control pack with our authentic OEM parts, backed by our comprehensive 1-year warranty. Most orders ship the same day for minimal downtime. Proper installation requires threading the sensor securely into the control pack housing and ensuring the O-ring creates a watertight seal to prevent moisture damage to your system.

Exact part number

34-39530-K

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • Hot Spring temperature probe
  • IQ2020 temp sensor
  • spa water temperature sensor
  • Watkins temperature sensor

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

Fits these brands and models

Compatible brands

Hot Spring SpasWatkins Wellness
Not sure if it fits your spa? Send us a photo — we'll confirm before you order

Common symptoms this part fixes

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

  • Spa displaying incorrect water temperature reading
  • Heater running continuously or not shutting off at setpoint
  • Spa not reaching set temperature
  • Error code or fault light related to temperature sensor on IQ2020 control pack
  • Wild temperature fluctuations shown on topside display
  • Spa going into overheat protection unexpectedly

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

Before you buy — quick checklist

  • Confirm your spa uses the IQ2020 control pack — this sensor is not universal across all Hot Spring models
  • Check the existing sensor for the part number printed on the sensor body or wiring harness tag before ordering
  • Inspect the existing sensor port threads for damage — a stripped 5/8" port will need repair before installing this sensor
  • Verify the O-ring on your current sensor is intact; if the port has been leaking, inspect the housing for moisture damage before replacing only the sensor
  • Note whether your spa is currently throwing a specific fault code — some IQ2020 error codes point to the high-limit sensor rather than this water temp sensor

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

Install difficulty: Medium — Some experience neededTypically 30–45 minutes

What's in the box

  • IQ2020 temperature sensor (34-39530-K)
  • O-ring seal

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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