12' Cable Hex Cap Bulb Sensor SD6600-166

Name: 12' Cable Hex Cap Bulb Sensor SD6600-166
Brand: Sundance Spas
SKU: SD6600-166
Price: 124.86 USD
Availability: InStock

Part #: SD6600-166

$124.86

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

About this sensor

This 12-foot cable hex cap bulb temperature sensor (SD6600-166) is an OEM replacement part designed for Sundance Spas systems. The sensor features a hex cap bulb design with a generous 12-foot cable length, providing flexibility for installations where the control box is positioned away from the sensing location. This genuine Sundance component effectively resolves common temperature-related error codes including HH (high limit), ICE (freeze protection), and OH (overheat) conditions.

When your spa displays temperature errors or fails to maintain proper heating cycles, this sensor delivers the precise temperature readings your control system needs. We guarantee an exact fit with your existing Sundance system, and every sensor ships the same day with our comprehensive 1-year warranty for complete peace of mind. Ensure your spa's electrical system is powered off before beginning any sensor replacement work.

Exact part number

SD6600-166

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Also known as / Replaces

This part replaces or is interchangeable with:

freeze sensor
hex cap bulb sensor
high limit sensor
OEM Sundance temp sensor
spa temperature sensor

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

Common symptoms this part fixes

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

Spa displaying HH (high limit) error code
Spa displaying OH (overheat) error code
Spa displaying ICE (freeze protection) error code
Spa not heating or failing to reach set temperature
Heater cycling on and off erratically
Control panel showing inaccurate water temperature readings

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

Before you buy — quick checklist

Confirm your spa is a Sundance Spas system — this is an OEM part and fitment is brand-specific
Locate your existing sensor and verify it uses a hex cap bulb style — not all Sundance sensors share the same bulb design
Measure or confirm you need a 12-foot cable length — a cable that is too short will not reach the control box
Check your current sensor's connector type before ordering to ensure plug compatibility with your control board
Power down the spa at the breaker before removing the old sensor — do not attempt hot-swap

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

Easy — DIY-friendlyTypically 15-30 minutes

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

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