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Grasslin 24HR 115V Time Clock FM-1 - Bubbles Supply

Grasslin 24HR 115V Time Clock FM-1

Part #: FM-1

$143.37
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About this time clock

The Grasslin 24HR 115V Time Clock FM-1 is a reliable SPDT timer control designed for hot tub and spa systems requiring precise scheduling automation. This 115-volt timer operates on a standard 24-hour cycle, making it ideal for controlling pumps, heaters, and lighting systems in residential and commercial spa installations. The single-pole, double-throw configuration provides versatile switching options for various electrical loads.

Built to Intermatic's exacting OEM standards, this time clock delivers the exact fit and performance your spa system demands. We guarantee precise fitment and back every unit with our comprehensive 1-year warranty, plus same-day shipping to get your spa running quickly. The robust construction ensures reliable operation in demanding spa environments where consistent timing control is essential. Verify your existing timer's voltage requirements and mounting configuration before installation to ensure proper compatibility with your spa's electrical system.

Exact part number

FM-1

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 24-hour spa timer
  • FM-1 time clock
  • Grasslin FM1
  • Intermatic FM1
  • SPDT time clock

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

Technical specifications

Voltage
115V

Common symptoms this part fixes

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

  • Spa pump or heater runs continuously with no shutoff
  • Spa equipment will not turn on at scheduled times
  • Timer trippers or pins are broken or stripped and won't hold a schedule
  • Timer dial is stuck or not advancing through the 24-hour cycle
  • Spa has no automated on/off scheduling at all

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

Before you buy — quick checklist

  • Confirm your existing timer is rated 115V — this unit is not compatible with 240V systems
  • Verify your load (pump, heater, or lighting) is compatible with an SPDT switching configuration
  • Check the amperage rating of the circuit to ensure it falls within this timer's rated capacity
  • Inspect the existing timer's mounting footprint and wiring terminals to confirm physical fitment
  • Note whether your spa requires a 24-hour cycle — this timer does not support 7-day programming

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

  • Grasslin FM-1 24HR time clock unit
  • Tripper/on-off pins for schedule programming

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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