Why gas issues deserve immediate attention
Gas systems are not a DIY area. In New Zealand, gasfitting is restricted work under the Plumbers, Gasfitters and Drainlayers Board (PGDB), which means the person doing the work must be appropriately authorised. That matters because a small fault can affect fire safety, carbon monoxide exposure, appliance performance, and insurance cover.
If you smell gas, see signs of incomplete combustion, or notice an appliance behaving differently, don’t treat it as a minor inconvenience. A licensed gasfitter can identify whether the problem is the appliance, pipework, regulator, ventilation, or installation setup — and fix it before it becomes dangerous or expensive.
Clear warning signs you should call a gasfitter
Some symptoms are obvious, while others are easy to ignore until they become a bigger problem. If you notice any of the following, it’s time to book a gasfitter promptly.
| Warning sign | What it may mean | How urgent? | |---|---|---| | Smell of gas | Possible leak from pipework, fittings, regulator, cylinder valve, or appliance | Urgent; turn off gas if safe and call immediately | | Hissing sound near gas lines or cylinder | Pressurised gas escaping | Urgent | | Yellow, lazy, or flickering flames | Poor combustion, blocked burner, incorrect air supply, or appliance fault | Promptly | | Soot around appliances or vents | Incomplete combustion or venting problem | Promptly | | Higher-than-normal gas bills | Leak, inefficient appliance, or control fault | Promptly | | Pilot light won’t stay lit | Thermocouple, gas supply, or draft issue | Promptly | | Appliance won’t ignite or keeps cutting out | Faulty ignition, gas supply issue, safety shut-off problem | Promptly | | Headaches, dizziness, nausea when appliance is running | Possible carbon monoxide exposure | Urgent; switch off appliance and ventilate | | Excess condensation on windows or walls | Poor ventilation or combustion by-products | Promptly | | Rust, corrosion, or damage on gas appliance components | Ageing, moisture exposure, or installation issue | Promptly |
If you can smell gas, treat it as an emergency
A gas smell is the clearest sign to stop using the area and act fast. Natural gas is usually odourised so leaks can be detected, and LPG has a strong, distinctive smell. Either way, a leak is not something to “keep an eye on”.
If you suspect a leak:
- Do not light matches, smoke, or use naked flames. - Do not switch electrical appliances or lights on or off if you can avoid it. - Open doors and windows if it is safe to do so. - Turn off the gas supply at the cylinder or meter if you know how and it can be done safely. - Move people away from the area, including pets. - Contact a licensed gasfitter or the gas supplier’s emergency line.
If the smell is strong, there is a loud hiss, or anyone feels unwell, leave the property and call emergency services if there is immediate danger. Delaying can increase the risk of fire, explosion, or exposure to harmful gas.
Appliance warning signs that should not be ignored
Many homeowners first notice a problem at the appliance itself. That could be a gas cooktop, continuous-flow water heater, space heater, decorative fireplace, or gas califont.
Common signs include:
- **Difficulty starting**: ignition failure, weak spark, blocked burner, or gas supply issue. - **Flame lifting, fluttering, or going out**: possible draught, ventilation issue, pressure problem, or faulty component. - **Soot or black marks**: likely incomplete combustion, which should be checked quickly. - **Unusual noise**: popping, roaring, whistling, or repeated clicking can signal a fault. - **Hot water taking longer than usual**: the unit may be underperforming or partially blocked. - **Burning smell, metallic smell, or unusual odour**: could be a combustion fault or nearby material overheating. - **Water leaking from a gas water heater**: may indicate internal corrosion or a failing component; gas and water issues can both be present.
If an appliance is old and has started to behave differently, don’t assume it is “just getting tired”. Age can make faults more likely, but the real concern is whether it is still operating safely and efficiently.
Health symptoms can point to a combustion problem
One of the biggest risks with gas appliances is carbon monoxide. It is invisible, has no smell, and can build up when an appliance is not burning fuel properly or is not venting correctly.
Watch for symptoms such as:
- headaches - dizziness or light-headedness - nausea - unusual tiredness - confusion - shortness of breath - feeling better when you leave the house
If these symptoms appear when a gas appliance is running, switch the appliance off if you can do so safely, get fresh air, and seek urgent medical advice if needed. Then arrange a gasfitter to inspect the appliance and flueing system. Do not keep using the unit while “waiting to see if it happens again”.
Seasonal situations in New Zealand that often reveal gas problems
In New Zealand, gas issues often become more noticeable in colder months. That’s when homeowners rely more heavily on water heaters, space heaters, and gas fireplaces, and when ventilation is often reduced because windows stay shut.
Common times to call a gasfitter include:
- **Autumn and winter**: heaters and hot water systems are working harder, revealing weak ignition, venting issues, or low supply pressure. - **Before winter starts**: a pre-season check is smart if you have an older heater, live in a colder region, or rely on gas for space heating. - **After a long period of no use**: appliances left idle over summer can develop ignition issues, corrosion, or dust-related burner problems. - **After renovations or appliance changes**: new cooking appliances, hobs, outdoor kitchens, or converted spaces can need proper gasfitting and testing.
In humid or coastal parts of the country, corrosion can also speed up wear on gas components, particularly outdoors or in poorly ventilated spaces.
When a gas issue needs urgent attention versus planned maintenance
Not every gasfitting call is an emergency, but all suspected leaks and combustion problems should be treated seriously. Use this simple rule of thumb:
- **Urgent today**: gas smell, hissing, suspected carbon monoxide exposure, visible damage to a gas line, or a flame that is clearly unsafe. - **Book soon**: appliance ignition problems, poor flame colour, unusual bills, repeated shutdowns, or noisy operation. - **Plan ahead**: routine servicing, replacement of ageing appliances, or checks before a cold season.
If you are unsure, err on the side of caution. A quick visit is far cheaper than repairing fire damage, replacing an appliance that has been damaged by misuse, or dealing with the health effects of a combustion fault.
What can happen if you delay calling a gasfitter
Putting off a gas issue often makes the repair more complicated and expensive. Small faults tend to create bigger ones.
Possible consequences of delay include:
- **Higher running costs**: inefficient combustion or a leak can waste gas. - **More damage to the appliance**: a minor ignition issue can strain other parts over time. - **Safety hazards**: leaks, fire risk, and carbon monoxide exposure can develop or worsen. - **Unplanned replacement**: a repairable appliance may become uneconomic if a fault is left too long. - **Insurance complications**: if a known issue contributes to damage, claims may be harder to resolve. - **More disruption**: waiting until winter, during a power cut, or when guests are staying often means longer call-out times and more inconvenience.
There’s also a practical market issue in New Zealand: winter is busy for heating-related trades, so the longer you wait, the harder it can be to get a prompt appointment.
What a gasfitter will usually check
A good gasfitter will do more than just “look at the flame”. Depending on the problem, they may inspect:
- gas supply and pressure - pipework and fittings for leaks - appliance ignition and burner performance - ventilation and combustion air supply - flueing and exhaust conditions - regulators, valves, and safety controls - signs of corrosion, damage, or incorrect installation
They may also test the appliance after repairs to confirm it is operating safely and within specification. For some jobs, they may need to isolate the appliance or gas supply while testing is carried out.
How to hire the right gasfitter in New Zealand
Because gasfitting is restricted work, credentials matter. Before booking, ask these questions:
- Are you licensed and authorised to do gasfitting work in New Zealand? - Can you provide a written quote? - Have you worked on this type of appliance or system before? - Will you issue the required paperwork or certification where applicable? - Is there a call-out fee, and how is travel charged?
It’s sensible to get **at least two or three written quotes** for non-urgent work, especially for appliance replacement or larger repairs. Compare not just price, but what’s included: diagnostics, parts, testing, certification, and whether disposal of an old appliance is part of the job.
Also check whether the work may intersect with other regulated trades. For example, a gas water heater relocation can involve plumbing, gasfitting, and possibly building work or council consent depending on the scope. Electrical controls or power points are a separate regulated area and must be handled by an appropriately authorised electrician.
If you’re replacing an appliance, don’t assume a like-for-like swap is simple
A new cooktop, heater, or water heater may not be a straight swap even if the old one “fits”. A gasfitter may need to confirm:
- supply capacity is adequate - the existing pipe size and pressure are suitable - the appliance is compatible with the fuel type and installation location - ventilation and flueing meet requirements - any cabinetry, clearances, or protection requirements are correct
If the replacement changes the installation layout, additional work may be required. In some cases, building consent or other approvals may be needed if the work forms part of a larger renovation or affects the building envelope. A good tradesperson should flag this early rather than leaving it to the last minute.
The bottom line
If you smell gas, hear a hiss, see weak or yellow flames, notice soot, or feel unwell when an appliance is running, call a gasfitter promptly. Gas problems rarely improve on their own, and the longer you wait, the greater the chance of higher costs, appliance damage, and serious safety risks.
For peace of mind, choose a licensed gasfitter, compare written quotes, and ask about testing and certification before any work starts.