Hot Tubs & Spas · Problems

Hot tub problems

Most hot tub problems trace back to one of four things: dirty filters, unbalanced water, a failing cover, or a component that has reached the end of its life. Check the filter and the water chemistry before calling anyone — those two account for a large share of no-heat, weak-jet, and cloudy-water complaints, and both are free to rule out.

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No heat or weak jets. Start with flow. A clogged filter or a low water level starves the pump, and many tubs will shut the heater down to protect themselves. Clean or replace the filter, top up the water, and see whether the problem clears before you pay for a call-out.

Tripping breaker. Stop using the tub and call a licensed electrician. A GFCI or breaker that trips repeatedly is detecting a fault, and a hot tub combines water with a high-current circuit. This is the one problem on this page you should never troubleshoot yourself or work around by resetting repeatedly.

Cloudy, foamy, or smelly water. Almost always chemistry or filtration: sanitizer out of range, pH or alkalinity drifted, a filter that needs cleaning, or water that is simply due for a change. Follow the dosing on your product labels and your owner's manual, and drain and refill on the schedule the manufacturer gives.

Rising electricity bill with no other symptom. Look at the cover first. A waterlogged cover is the most common quiet cause. This Old House puts normal above-ground operating cost at $25–$35 a month; a bill drifting well above your established baseline is a signal something has changed, usually the cover or a filter.

How to choose

Check filter and water level before calling for service: Low flow causes a surprising share of no-heat and weak-jet complaints, and it costs nothing to rule out.
Never keep resetting a tripping breaker: It is detecting a fault. Stop using the tub and get a licensed electrician. This is a shock hazard, not an inconvenience.
Write down your normal monthly power cost: You cannot spot a problem in your bill without a baseline. Note it in the first stable month of ownership.
Look up the error code in your manual first: Most control packs display specific codes with defined meanings. Knowing the code before you call makes the call shorter and cheaper.
Get a diagnostic price before authorizing repair: Ask for the call-out fee, the hourly rate, and whether the diagnostic is credited against the repair. Get the parts quote before work starts.

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All hot tubs & spas problems

Hot Tub Not Heating

Hot Tub Leaking

Cloudy Hot Tub Water

Hot Tub Pump Noise

Tripping Gfci

Hot Tub Jets Not Working

Deck Cant Hold Hot Tub

High Hot Tub Electric Bill

FAQ

Hot Tubs & Spas problems — common questions

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Why is my hot tub not heating?

Most often a flow problem — a clogged filter or low water level causing the heater to shut down protectively. Clean the filter and check the level first. If it persists, it is likely the heater element, a sensor, or the control pack, which need a technician.

Why does my hot tub keep tripping the breaker?

The breaker or GFCI is detecting a fault. Stop using the tub and call a licensed electrician. Repeatedly resetting it defeats a safety device on a high-current circuit surrounded by water.

Why is my hot tub water cloudy?

Usually sanitizer or pH out of range, a dirty filter, or water that is overdue for a change. Test the water, clean the filter, and follow your product label dosing and your manual's drain schedule.

Is a hot tub leak a big deal?

It depends where it is. A loose union fitting in the equipment bay is minor; a leak in plumbing under the shell foam can be labor-intensive to find. Get the diagnostic priced separately from the repair before you authorize work.

Sources

Where these figures come from

This Old House — Hot Tub Cost (operating cost baseline) · retrieved 2026-07-26