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In this post, we will give you a step-by-step guide for replacing your spa’s Watkins No-Fault Spa Heater. Just follow these steps and your spa will be up and running in no time!


It’s a beautiful, brisk, spring morning. The birds fill the air with music; glorious sunbeams stream through the tree-tops like glowing waterfalls. What a perfect morning to sit and wake up slowly in a warm soothing spa. I happily walk over to my spa, filled with anticipation… I remove the cover only to find an ice cold, lifeless, pool of dissatisfaction! Nooooooooo… Alas, I am doomed. (I know it’s a little dramatic, but you get the point.)

SAFETY FIRST

Risk Of Electrical Shock – Always verify that all power is turned off to the subpanel that powers your spa.

Tools Needed-

  • Hose Clamp Pliers ( or Wine Corks!)
  • Needle Nose Pliers
  • Phillips Screw Driver
  • Flat Head Screw Driver

Step 1

Power down your spa by unplugging it from the outlet (120V Spas), or turning off at the main sub-panel breakers (220V Spas).

Step 2

Remove the front panel of the spa to gain access to the equipment compartment.

Step 3

Open the Control Box in the equipment compartment and locate all of the cables that lead to the heater. Be sure to make a note of where all of the heater cables are plugged in on the circuit boards. Disconnect all of the cables (from the circuit boards) that lead to the heater.
NOTE: Do not unscrew the sensors from the heater at this point; just unplug them from the control box.

Step 4

Locate the copper bonding wire and disconnect it from the heater. Leave the other end connected to the control box.

Step 5

With the heater cables and bonding wire disconnected, pinch and slide the 3/4″ tube spring clamps back from the inlet and outlet ports of the heater. Do the same for the 1/4″ tube spring clamp located on the backside of the heater.

Step 6

Use a heat gun or blow dryer to heat up the 3/4″ tubing attached to the heater inlet/outlet. This makes the tubing much easier to remove.

Step 7

IF SPA IS DRAINED-
Remove the 3/4″ tubing from the heater inlet/outlet.
IF SPA IS NOT DRAINED-
Quickly remove and plug the 3/4″ tubing, one tube at a time.
OR
Use hose clamps to stop the water flow to the heater.
The faster you do this step, the less water you will lose.
PRO TIP: You can use wine corks to plug the 3/4″ tubes!

Step 8

Remove the 1/4″ bleedline tube from the backside of the heater.

Step 9

Unscrew the heater from the equipment compartment floor and remove the heater from the spa.

Step 10

Carefully unscrew the thermistors (sensors) from the heater and remove the o-rings.

To install the new Watkins No-Fault Heater, simply reverse steps 1-10!

  • Install the thermistors into the heater
  • Screw the heater to the floor of the equipment compartment
  • Attach all of the plumbing
  • Slide the spring clamps into position
  • Plug all of the cables coming from the heater into their proper places in the control box, and reinstall the copper bonding wire.
  • Screw the lid back on the control box and secure the front panel (door) back into place.
  • Restore power to your spa and enjoy!

Our goal is to provide you with everything you need to have the most enjoyable and healthy experience in your Spa!

If you are looking for HotSpring Spa replacement parts or water care products for your spa, Backyard Plus has what you need!

For more helpful tips and How To Videos, visit our YouTube channel!

Thanks for reading!

If there are any topics you would like to learn about pertaining to your HotSpring Spa, please let us know.