1.43 Fuse Replacement

Power Down Plunge

• Pause the chiller by pressing the pause button on the UI
  • ⚠️ Powering down the Plunge while it's in a cooling cycle can damage the chiller. 
• Press the test button on the GFCI outlet to power down the Plunge.
• Unplug the GFCI outlet from the outlet.

🚨 Important: Do not power down the Plunge before pausing the chiller.

Step 1: Remove Chiller Vents and Thumb Nuts

• Remove both side chiller vent panels.

• Unscrew all 6 thumb nuts securing the rear panel:

  • 3 on the left vent

  • 3 on the right vent

Step 2: Remove Rear Cover

• Grab the rear cover by the vent openings and slowly pull and wiggle the rear cover free. 

Step 3: Locate & Remove Fuse

• • Locate the fuse holder on the back of the electrical box, near the base of the tub.

  • Look for a black circular cap (about the size of a penny) labeled “FUSE.”

  • Use a quarter, penny, or small flat tool to fit between the tub and the electrical box.

  • Insert the tool into the slot and unscrew the fuse holder completely.

  • Once loose, if the fuse holder doesn’t come out easily, use a pair of pliers to carefully pull it out.

🚨 If the fuse itself remains stuck inside the receptacle, refer to the follow-up instructions on how to safely remove it without disconnecting the chiller or draining the tub.

🚨 If the Fuse did not get stuck in receptacle, jump to Step 8

Step 4: Remove E-Box Cover

• Use a 2.5mm hex screwdriver to remove the 4 screws securing the e-box cover.

🚨 If the Fuse did not get stuck in receptacle, jump to Step 8

Step 5: Loosen Fuse Receptacle Nut & Remove Fuse

• Use a pair of pliers to loosen the nut securing the fuse receptacle to the electrical box.

• Once loosened, the fuse receptacle will have enough movement or play to work with.

• Tap and gently wiggle the fuse holder back and forth to help loosen the fuse inside.

• Continue wiggling until the fuse begins to slide out of the receptacle.

• Once the fuse is exposed enough, grip and fully remove it from the holder

🚨 If the Fuse did not get stuck in receptacle, jump to Step 8

Step 6: Tighten Fuse Receptacle Nut

• Use pliers to tighten the fuse receptacle nut back onto the electrical box.

• Make sure the receptacle is secure and fully seated against the electrical box surface.

🚨 If the Fuse did not get stuck in receptacle, jump to Step 8

Step 7: Install E-box Cover

• Using a 2.5mm hex screwdriver, begin installing the electrical box cover.

• Slide the cover into place and screw each of the 4 screws.

Step 8: Replace Fuse

• Remove the old fuse from the holder.

• Insert the new replacement fuse into the fuse holder.

• Push the fuse firmly into the holder so it’s fully seated before reinstalling.

Step 9: Install New Fuse

1. Place the fuse holder back into the fuse receptacle on the electrical box.

2. Push in and screw the holder in tightly to ensure a solid connection.

3. Make sure the fuse is fully seated and secure so that chiller vibrations do not loosen it.

4. Confirm that the fuse is not loose and the cap is flush with the electrical box.

Step 10: Test Plunge Power

• Plug the GFCI power cord into a grounded outlet.

• Press the reset button on the GFCI plug.

• Look for an orange light in the small GFCI window to confirm power is active.

• Listen for the startup sequence from the UI.

• The UI display will flash “HI”, followed by the current water temperature.

• Wait 60 seconds to ensure power stays on

Power Down Plunge

• Pause the chiller by pressing the pause button on the UI
  • ⚠️ Powering down the Plunge while it's in a cooling cycle can damage the chiller. 
• Press the test button on the GFCI outlet to power down the Plunge.
• Unplug the GFCI outlet from the outlet.

🚨 Important: Do not power down the Plunge before pausing the chiller.

Step 11: Install Rear Cover

• Carefully slide rear cover over chiller.

• Ensure power cord is routed through the correct side.

• Reinstall all 5 thumb nuts to secure rear panel.

• Attach the left and right chiller vents.

Step 12: Finalize Installation

• Follow the End-of-Job Checklist to ensure all tools, connections, and cleanup steps are complete.