Hot Tub Jets Weak or Not Working
easy 30–90 min
Tools: screwdriver, old toothbrush, bucket, towel, flashlight · Materials: white vinegar or a descaler, filter cleaner or a new cartridge, jet internals if a jet is broken
Steps
- Open the air controls (the knobs on the rim) fully and turn the diverter valve to each side; half the 'weak jets' calls are a diverter sending water to the other seat.
- Check the water level: it must cover the skimmer by a few centimetres, or the pump draws air and the jets sputter.
- Pull the filter and run the pump without it for a minute: strong jets mean a clogged filter, so clean or replace it.
- Twist each weak jet face to fully open, or remove the jet insert and soak it in vinegar to dissolve the calcium ring, then scrub with a toothbrush.
- If the jets surge and gurgle, bleed the air lock: loosen the union on the pump outlet a quarter turn until water weeps, then tighten.
- Turn a stuck rotating jet by hand after soaking; if it will not spin, the insert is worn and is a snap-in replacement.
Stop and call a pro if
- the pump hums and does not start, trips the breaker, or drips from its seal
- all jets are weak with a clean filter and open diverters — the impeller or the pump wet end is failing
- water leaks under the cabinet
What a pro does that you can't
A spa technician replaces a worn impeller or pump seal, repairs a diverter valve, and finds a suction-side blockage or a cracked manifold hidden in the cabinet.
DIY cost: $0 for cleaning; $10–30 per jet insert