Pool Heater Not Heating
1992
Established in
2,500+
Local pools serviced
5.0
Average google rating
48hr
Average quote turnaround
Why Auckland trusts our pool service expertise
A pool heater that runs but fails to heat the water usually comes down to a handful of common causes. Most can be identified with a few basic checks before a technician is needed.
The points below summarise the key things to check and when to hand the job over to a professional.
What you'll learn
Pool heater still not working?
Sparkling Pools diagnoses and repairs pool heaters across Auckland. Get in touch Monday to Friday and we'll help you work out what's going on.
What It Usually Means When Your Pool Heater Stops Heating
A pool heater that runs but fails to warm the water is one of the more frustrating equipment faults, especially heading into summer. The good news is that many causes are straightforward to identify, even if the fix itself requires a professional.
Pool heaters, whether heat pumps or gas units, rely on several systems working together: water flow, electrical supply, gas supply or refrigerant, and the unit's own controls. When any one of these fails, the heater may appear to operate normally while producing little or no heat.
This guide covers what you can safely check yourself, what needs a qualified technician, and how to keep the problem from recurring.
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What You Can Safely Check Yourself
Before calling anyone out, work through these checks in order. They are all visual or control-level, no tools, no panels, no gas connections.
1. Check the Water Flow
Pool heaters require a minimum flow rate to operate. If flow is too low, most units will shut down the heating function as a safety measure, and some will display an error code.
- Check that your pump is running and that the filter pressure looks normal
- Make sure all valves in the system are fully open
- If your filter is overdue for a backwash or clean, restricted flow is a likely culprit
- A dirty or clogged filter is one of the most common reasons a heater underperforms
2. Check the Thermostat Setting
This sounds obvious, but it is worth confirming. If the thermostat is set below the current water temperature, the heater will not fire.
- Check the set temperature on the heater's control panel
- Make sure the display is reading the water temperature correctly, a faulty temperature sensor can cause the unit to think the water is already warm
3. Check for Error Codes
Most modern pool heaters display fault codes when something is wrong. Check the display panel and note any codes shown. These codes are documented in the unit's manual and can help a technician diagnose the fault quickly.
4. Check the Electrical Supply
Confirm the heater is receiving power:
- Check the isolator switch near the unit is in the ON position
- Check the relevant circuit breaker in your switchboard has not tripped
- If the breaker has tripped, reset it once, but if it trips again, do not reset it a second time. That is a sign of a fault that needs investigation.
5. For Heat Pumps, Check the Airflow
Heat pump pool heaters draw heat from the surrounding air. If airflow to the unit is restricted, performance drops significantly.
- Make sure there is clear space around the unit, no debris, overgrown plants, or objects blocking the air intake or exhaust
- Check that the fan is spinning when the unit is running
- In cooler weather, heat pump efficiency drops naturally, this is normal, not a fault
6. For Gas Heaters, Check the Gas Supply
If you have other gas appliances in the home, check whether they are working normally. If they are not, the issue may be with the gas supply rather than the heater itself. Contact your gas supplier.
Do not attempt to inspect gas connections, burners, or heat exchangers yourself.
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What Needs a Technician
If the checks above do not identify the problem, or if you identify a fault but cannot safely resolve it, the heater needs a qualified technician. The following faults are not DIY repairs.
Gas-Related Faults
Anything involving the gas supply, burner, ignition system, or heat exchanger must be handled by a licensed gas fitter. This includes:
- The heater igniting but not staying lit
- The burner not igniting at all despite gas being available
- Any smell of gas near the unit
- Visible damage to the heat exchanger or flue
If you smell gas near the heater, turn the unit off at the isolator, do not use any ignition sources nearby, and contact a licensed gas fitter.
Electrical Faults
Faults inside the heater's electrical components, control boards, sensors, capacitors, contactors, require a qualified electrician or a technician authorised to work on that equipment. Do not open the heater's electrical panel.
Refrigerant Issues (Heat Pumps)
If a heat pump heater is running but producing no heat, and airflow and water flow are both fine, the refrigerant circuit may be at fault. Refrigerant handling is regulated, it must be carried out by a certified technician.
Persistent Error Codes
If the heater is displaying a fault code that does not clear after addressing the obvious causes (flow, temperature setting, power), a technician needs to diagnose it properly. Repeatedly resetting a fault without identifying the cause can cause further damage.
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Preventing Heater Problems
Most heater faults are either flow-related or the result of deferred maintenance. A few straightforward habits reduce the risk considerably.
Keep the filter clean. A clean filter maintains the flow rate the heater needs. If your filter is running at high pressure, backwash or clean it before the heater starts throwing flow errors.
Service the heater annually. An annual check by a qualified technician, before the swimming season, catches worn components, clears error history, and confirms the unit is operating safely. This is especially important for gas heaters, where combustion components need periodic inspection.
Keep the area around a heat pump clear. Trim back any plants and remove debris from around the unit regularly. Restricted airflow is a slow performance killer.
Do not run the heater without water flow. Always confirm the pump is running before switching the heater on. Running a heater dry, even briefly, can cause serious damage to internal components.
Check the unit after extended periods of non-use. If the heater has been off for several months, run through the basic checks above before expecting it to perform at full capacity.
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When to Call Sparkling Pools
Sparkling Pools provides equipment diagnosis and repair for pool heaters across Auckland. If you have worked through the checks above and the heater is still not performing, or if you have identified a fault that needs a professional, get in touch.
Call 09 570 4797 or freephone 0800 794 673, Monday to Friday, 8:00am to 4:30pm. You can also email info@sparklingpools.co.nz.
Pool resurfacing solutions
Restore your pool with durable plaster finishes
Work completed
Sparkling Pools has worked on pools across Auckland, including residential renovation projects, equipment upgrades, ongoing maintenance and pool care for managed properties. Past projects show how the right approach can improve presentation, water quality and day-to-day usability. A well-maintained pool is easier to manage, more pleasant to use and better prepared for seasonal changes.
"The transformation was remarkable. Our old pool looked tired, but now it's the centerpiece of our backyard."
James Mitchell
Homeowner, Kumeu
View project
Seb and team a great job of replastering our 23 year old pool and changing the chemical system to ozone. Highly recommended!! Thanks
S Johns
St Heliers
View project
In November 2011, my partner and I purchased a property with a swimming pool and spa. Having never previously owned a property with pool facilities, we relied on Grant, Julia and the rest of the team at Sparkling Pools to bring us up to speed with what was required to keep the pool in order. Combined with this, some pool equipment components had been neglected by previous owners; Grant made time to come and carry out a complimentary inspection of the pool, from a holistic perspective, and to give us detailed feedback on what improvements (heating, filtration equipment, covers etc) we could make, over time, bearing our budget in mind. The pool and spa are now looked after on a regular basis by Sparkling Pools on a specific customised maintenance plan. Denis (our dedicated valet man) comes on time, on the same week-day each time, and he does a great job maintaining the pool. We love the team from Sparkling Pools and we love the service we get from them. The pool and spa always look and feel fantastic, and looking after them is one job we just never have to worry about!
Nigel Shanks
St Mary's Bay
View project
Our older pool was looking incredibly worn and really needed a complete refresh to match the character of our heritage property here in New Zealand. The team completely transformed the space. The new Santorini blue plaster and updated waterline tiles breathed completely new life into the area without losing its original elegance. The upgrade to modern LED lighting means the pool looks absolutely stunning in the evenings, creating a perfect atmosphere for entertaining. The entire process was incredibly professional, and the final result perfectly complements our home.
Sarah Jenkins
Kohimarama
View project
Last winter, Sparkling Pools undertook the renovation of our swimming pool. Sparkling Pools did a terrific job and we were delighted with the results. SPL’s performance throughout the project was very professional. Senior management constantly checked the work at different stages and they maintained excellent communication with us throughout. We are happy to commend Sparkling Pools to other Auckland pool-owners who might be considering pool interior renovations or equipment upgrades, particularly noting their reliability, their professionalism and the obvious pride they take in their work and their products. Subsequent to the pool renovations, SPL has continued to look after our pool on a regular basis and we are very happy to have them do so. With SPL looking after our pool, it is now one aspect of property care I never have to worry about.
Colin Herring
Kumeu
View project
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