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Troubleshooting

Hot tub problems

Updated October 2026

Most hot tub problems start with something you can safely check yourself. Pick what your tub is doing for the quick checks, and the signs that it’s time to call an engineer.

Problem by problem

Quick checks you can do safely

Not heating

Quick checks

  • The set temperature is above the water temperature.
  • The water is above the filter intake.
  • The filters are clean.
  • Check the display for a code (see below).

Call us if it still won’t heat after a few hours, or a flow code keeps coming back.

More: hot tub not heating.

No power or tripping

Quick checks

  • The isolator next to the tub is on.
  • The RCD or breaker at the consumer unit hasn’t tripped.

Call us if the RCD trips again. Don’t keep resetting it: switch off at the isolator.

More: hot tub tripping the electrics.

Leaking

Quick checks

  • Look for wet patches under the cabinet and around the equipment bay.
  • Check the filter housing and its lid seal.
  • Keep the water above the filter intake, so the heater and pumps aren’t running short.

Call us if you can see water near the electrics (switch off first), or the level drops faster than evaporation.

More: hot tub leaks.

Weak or no jets

Quick checks

  • The filters are clean.
  • The jets are open: twist each face.
  • The air controls on the tub’s edge are open.
  • Any diverter valves are set to the seats you want.

Call us if a pump hums but doesn’t spin, or runs with no water moving. Switch it off: running a pump dry damages it.

A worn impeller is a common cause. See black bits in hot tub water.

Noisy pump

Quick checks

  • The water level is high enough. Low water lets the pump draw in air and gurgle.
  • Nothing is caught in the filter area.

Call us if you hear grinding or screeching (usually worn bearings), or a pump hums and won’t start.

We test and replace pumps: hot tub repair.

Cloudy water

Quick checks

  • Test the sanitiser and pH, and correct them.
  • Rinse the filters, and deep-clean them every few weeks.
  • Replace a filter when the pleats are torn or flattened, or it stays dirty after a deep clean.

Call us if the water clears and then clouds again, or you see black bits.

Start with our filter cleaning guide, or the bromine and chlorine guides.

Codes

An error code on the display

Codes depend on the control system, not the make of tub. The name is usually on the topside panel or the label on the control pack.

Other system, or not sure? Use our hot tub error code guide.

Don’t keep resetting a code that comes straight back. It’s there to protect the tub. Switch off and call us.

Google reviews

Problems solved

5.0

From 47 reviews on Google

See all our reviews
“I gave Jon a call over the weekend, and he gave me advice over the phone - which actually lead to me sorting out the issue, free of charge (because he didn’t have to come out). That really is awesome service. Thank you, Jon!”
Dr Ben Makin (BenTheRadioGuy)
“Called Jon last minute as the hot tub stopped working and Jon messaged straight away to say he was on a job and would get back to us asap and he did, called this evening and was so so helpful!! Explained to my husband about things he can check himself and he was so honest to explain that it might be something we can fix before he comes out. If the problem can't be solved we will 100% call Jon out to help us, thanks Jon! This is what customer service should be like everywhere!”
Hayley Verran
“Amazing service - came out to repair our hot tub over Christmas. Knowledgeable and extremely helpful, Jon got everything sorted quickly. Would 100% recommend.”
Gareth Dickson

Hot tub still playing up?

Ring or WhatsApp us with what it’s doing and a photo of any code.

If your tub is sunk into decking or the ground, or set against a wall, it helps to mention it when you book. If you’re not sure, a photo is fine.

Areas

Where we work

We’re based in Tuckingmill, Camborne, covering Mid and West Cornwall, from Bodmin and Newquay to Penzance and everywhere in between. Towns we cover include:

See the 18 towns we cover

Somewhere else in Cornwall? Just ask. Every area we cover

Call 01209 808617