Hot Tub Jets or Bubbles Not Working? Here's How to Fix It

You've got the tub up to temperature, you climb in, press the bubble button and… nothing. Or a feeble dribble of air on one side. It's one of the most common faults we're asked about across Bournemouth, Poole and Christchurch — and it spikes every summer when tubs get the most use. The good news: most "no bubbles" problems are mechanical and obvious once you know where to look, and a fair share are fixable without an engineer.

This guide covers all brands — Lay-Z-Spa (AirJet and HydroJet), Intex PureSpa, MSPA, CleverSpa and hardshell hot tubs. We start with the 60-second checks and work through to faults that need a professional.

💡 First, know your system Inflatable tubs have two different "jet" systems. AirJet blows air bubbles through holes around the base (a blower motor). HydroJet pushes water through directional massage jets (a water pump with an impeller). They fail in different ways, so identify which one has stopped before you troubleshoot.

Quick Checks First (60 Seconds)

1. Has the 20-Minute Timer Just Run Out?

This catches more people than you'd think. On almost every Lay-Z-Spa, the AirJet bubble function runs for about 20 minutes and then switches itself off automatically — it's a built-in safety feature to stop the blower overheating, not a fault. Simply press the bubble button again to restart it. If it restarts fine, there was never a problem.

2. Is the Control Panel Locked?

Many newer pumps auto-lock the panel after about 5 minutes of inactivity (look for a padlock icon on the display). A locked panel will ignore the bubble button entirely. Press and hold the lock button to unlock, then try the bubbles again.

3. Is the Heater or Filter Running at the Same Time?

Some models won't run the bubbles and the heater simultaneously, or will pause one for the other. Turn the heater off for a moment and test the bubbles on their own to rule this out.

The Single Most Useful Test: Air Flow at the Pump

This one test tells you whether the fault is in the pump or in the tub/liner — which completely changes what you do next. It's the same diagnostic Bestway's own support team uses:

Turn the tub off and fit the stopper caps into the two ports on the liner (these came with the tub — they seal the holes so you can detach the pump without water pouring out).
Detach the pump from the liner.
Power the pump back on and press the bubble / massage button.
Hold your hand over the air outlet on the pump and feel for airflow.

Strong air from the pump → the blower is fine and the problem is downstream in the liner (a split seam or blocked ports — see below).

Little or no air from the pump → the fault is in the pump itself (blower motor, overheat cut-out or control board). Skip to the pump section.

If the Pump Pushes Air But the Tub Has No Bubbles

Split or Torn Massage Seam

The bubbles are fed through an air channel built into the seam running around the base of the liner. Over years of inflation, folding and storage, this seam can split — the air then escapes inside the wall instead of coming out of the jet holes. Tell-tale signs:

Bubbles work weakly or only on one section of the tub
A noticeable bulge or surge in one part of the liner wall when the bubbles are on
Air clearly escaping somewhere other than the floor jets

Run your hand around the inside base while the bubbles are on to find where the air is and isn't coming through. A split seam usually means a replacement liner (or a warranty claim if the tub is new) — it's rarely worth patching as it tends to fail again.

Blocked Air Ports

The little bubble holes around the floor of the tub can clog with debris, hair, scale or biofilm — especially in hard-water parts of Bournemouth and Poole, and especially mid-summer when the tub is used heavily. Drain a little and inspect the holes; a gentle clean with a soft brush often restores full flow. Keeping on top of water chemistry and filtration stops this recurring.

Cold-Weather Ice in the Blower Line (Off-Season)

Less relevant in summer, but if you've started the tub in cold conditions, ice in the air line can block the bubbles until the system warms through. Let it reach temperature and retry.

If the Pump Produces No Air At All

Overheated Blower (Thermal Cut-Out)

The blower motor has a thermal cut-out that shuts it down if it gets too hot — common if the bubbles have been run for long stretches or the pump sits in direct sun. The fix is simple but slow: unplug the pump and leave it to cool for up to two hours, then plug back in and press the bubble button. If the bubbles return, it overheated; keep the pump shaded and don't run bubbles back-to-back for long periods.

Failed Blower Motor

If there's no air even after a full cool-down — and the heater and filter still work fine — the blower motor itself has likely failed. This is an internal pump part. On many models the blower is a separate motor from the heating circuit, which is why your tub can still heat perfectly while the bubbles are dead (a very common pattern we see). This needs an engineer.

Control Board (PCB) Fault

If the panel registers the button press but nothing happens, and the blower itself tests OK, the control board may not be sending power to the blower circuit. Diagnosis needs a multimeter and should be left to a professional.

⚠️ Important Safety Note Never open the pump housing or test internal electrical components yourself. Hot tub pumps run at mains voltage and contain capacitors that hold charge even when unplugged. Air-flow tests, port cleaning and cool-downs are safe; anything inside the pump casing is an engineer's job.

HydroJet Models: Weak or No Water Jets

On HydroJet and HydroJet Pro models (Milan, Hawaii, Maldives, Santorini and similar), the water massage jets are driven by a pump impeller — a small propeller that forces water through the jets. If the directional jets are weak or dead while the air bubbles still work:

Cracked or worn impeller — the most common HydroJet fault. Water flow drops, jets weaken, and the same loss of flow can knock out heating too.
Blocked debris screens — calcium and grit build up on the intake screens, starving the pump of water. Clean them as part of routine maintenance.
Air lock in the line — sometimes clears by briefly cycling the pump after a refill.

A worn impeller is a replaceable part for an engineer and far cheaper than a new pump.

Bubbles Still Dead? Get Expert Help

If the pump produces no air after cooling, or the blower/impeller has failed, it's time for a local engineer. We'll match you with someone who knows your brand.

📞 Get a Free Quote

How Much Does a Jet / Bubble Repair Cost?

Typical costs in the Bournemouth area for bubble and jet faults:

Clearing blocked air ports / debris screens: £0 (DIY)
Replacement liner (split massage seam): £60-150 depending on model
HydroJet impeller replacement: £30-70 + labour
Blower motor replacement: £60-120 + labour
Control board (PCB): £80-200 + labour
Typical engineer call-out: £40-80 (often includes the first 30 mins of labour)

Most bubble/jet repairs land in the £80-200 range all-in — well below the £200-400+ of a replacement pump, let alone a whole new tub.