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72" Hi Limit Sensor 34-0203Y-VH2-K - Bubbles Supply
Exact Fit

72" Hi Limit Sensor 34-0203Y-VH2-K

Part #: 34-0203Y-VH2-K

$190.39
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1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this sensor

The HydroQuip 72" Hi Limit Sensor (34-0203Y-VH2-K) is a genuine OEM temperature and high limit safety sensor designed for Gecko Y-Series spa control systems. This critical safety component features a 72-inch cable length and 1/4" bulb diameter, making it suitable for larger spa configurations where extended reach is required. The sensor monitors water temperature and automatically shuts down heating elements when dangerous temperature levels are detected, preventing overheating conditions that could damage your spa or create safety hazards.

This authentic HydroQuip sensor comes with our exact fit guarantee, ensuring perfect compatibility with your spa's control system. We ship same-day from our Canadian warehouse and back every sensor with a full 1-year warranty for complete peace of mind. The extended 72" cable provides flexibility for installation in various spa layouts while maintaining accurate temperature monitoring. Always verify your existing sensor's cable length and bulb specifications before installation to ensure proper fitment and safe operation.

Exact part number

34-0203Y-VH2-K

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • HHL Sensor
  • Hi-Limit Sensor
  • High Limit Sensor
  • Overheat Sensor
  • Temperature Safety Sensor
  • Y-Series Hi Limit Probe

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

Fits these brands and models

Compatible brands

HydroQuipGecko
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:

  • OH or OHH error code on spa topside display
  • HH error code — spa reading water as too hot
  • Spa shuts down unexpectedly during normal operation
  • Heater not activating — system locked in overheat protection mode
  • ICE or FLO error when combined with a faulty temperature reading
  • Spa heats erratically or overshoots set temperature

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

Before you buy — quick checklist

  • Confirm your spa runs a HydroQuip or Gecko Y-Series control system — this sensor is not universal
  • Measure your existing sensor's cable length — this is a 72-inch lead; shorter versions exist and are not interchangeable
  • Check your existing sensor's bulb diameter — this unit uses a 1/4" bulb
  • Locate the sensor connector on your control board and compare it visually before ordering
  • Diagnose whether the fault is the hi-limit sensor or the temp sensor — they are separate components and throw different error codes

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

Install difficulty: 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

AI Fitment Assistant

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

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