We know the shock when no hot water gas leaves your taps cold. Start with simple, safe checks you can do now to see if the issue is a basic fault or needs a pro. We’ll guide you through clear steps so you can decide whether to keep troubleshooting or call for help.
Put safety first. Stay inside the manufacturer’s instructions and avoid any work that could void a warranty or create a hazard. Many tanks and continuous flow units have warranties from 12 months to up to 10 years, so check your paperwork before attempting repairs.
If quick checks don’t restore service, contact OnCall Emergency Plumbers in Melbourne. We provide 24/7 emergency and general plumbing, use branded quality parts, and offer fair pricing. Call us on 1800 571 216 and we’ll attend promptly.
Key Takeaways
- Try basic safety checks first, but stop if unsure.
- Follow manufacturer guidance to protect warranties.
- Older units near 10 years may need replacement.
- Smell or hiss? Shut down, ventilate and call us immediately.
- OnCall offers 24/7 Melbourne service with licensed plumbers.
Why your gas hot water may have stopped and how we’ll approach it today
When your heater stops delivering warm taps, quick checks often reveal the cause.
Common faults include an extinguished pilot, a disrupted supply, ignition faults, or low flow in continuous flow systems.
We start with safety checks and then inspect the model-specific ignition steps for storage tanks and continuous units. We verify both the water and gas inputs and confirm control settings before attempting any relight.
Environmental factors like wind or recent meter work can affect pilot stability and water pressure. If your hot water heater is near ten years old, faults can compound and replacement may be more cost-effective than ongoing repairs.
- We follow manufacturer instructions to protect warranties.
- We avoid actions that could introduce build-up or damage components.
- We call out clear signs to stop and request professional help.
If any check is unsafe or the unit won’t respond, we’re ready 24/7 across Melbourne. Call 1800 571 216 for urgent plumbing assistance and prompt service.
No hot water gas: quick safety checks and simple fixes to try first
A quick, calm inspection can often spot the source of the fault without risk.
Smell gas? If you detect a strong rotten-egg odour or hear hissing, turn gas supply off at the nearest switch only if it is safe to reach. Open doors and windows, evacuate the area, and call our emergency line. Signs like mercaptan smell or hissing near the heater point to a possible gas leak.
Check the gas valve to the unit is fully open and confirm other gas appliances in the home are working. If multiple appliances fail, this suggests a wider supply issue rather than the unit itself.
Inspect the pilot window and follow the manufacturer’s instructions exactly before attempting a relight. Open a nearby hot tap to confirm flow — low flow will stop ignition. Check thermostat settings to ensure the temperature is set correctly and power has not reset the controls.
Look for visible leaks around the bottom, pipe joints and valves. Condensation is common; continuous dripping, rust streaks or pooling means a leak that needs attention.
- If you detect a leak or persistent smell, stop and call us on 1800 571 216.
- When unsure, let our licensed team handle the problem; we’re available 24/7 and use trusted parts.
- For local service, see our page on hot water repairs in Southbank.
Storage tank gas hot water systems: pilot light, burner and thermocouple tips
Before you touch any controls, we secure the area and read the maker’s directions. We remove flammables, find the access cover and locate the instructions often printed behind the cover near the bottom of the tank.
Turn controls to OFF and wait
We turn the control to OFF and wait five minutes so any unburnt gas can disperse. This short pause reduces risk and gives us time to confirm the area is well ventilated.
Lighting the pilot
We set the control to pilot, press and hold to feed gas to the pilot, then use the ignition button repeatedly for up to 30 seconds. After the pilot lights, we keep holding the control for about 20 seconds, then release and check the viewing window for a steady blue flame.
After relight and troubleshooting
Once the pilot light is steady, we turn the control to the operating setting, replace the access cover, and listen for the main burner. A brief whoosh as the burner starts is normal; it should quieten quickly.
- If the pilot won’t stay lit, the thermocouple may not sense heat or the valve may be faulty — don’t keep trying; call us.
- We avoid forcing knobs with tools; stuck controls often mean a professional is needed.
- Unsure or not confident? For safe assistance in Melbourne, call OnCall Emergency Plumbers on 1800 571 216. We’re available 24/7 and use quality parts from reputable brands at fair prices.
Instantaneous and continuous flow gas hot water systems: ignition and flow checks
Start by identifying how your instantaneous unit is triggered before you test anything else. We confirm the ignition type, power and minimum flow needed to fire the burner. This helps us avoid wasted checks.
Identify the ignition method
Many modern systems use 240V electronic, battery electronic, or hydro start ignition. Older models may still have a pilot.
Power, batteries and flow checks
We first check the 240V outlet or isolation switch. For battery models we inspect the cells and replace flat or corroded batteries. For hydro start units we confirm there is adequate flow.
- Open a nearby tap fully to meet the minimum activation rate.
- Listen for clicks and a light as the burner fires; if silence persists, recheck power and flow.
- Inspect the unit bottom for battery compartments or fuses and confirm secure connections without forcing clips.
- Ensure the supply is on and other appliances operate before further attempts.
| Ignition Type | Key Check | Common Fault |
|---|---|---|
| 240V electronic | Verify outlet and isolation switch | Tripped breaker or loose connection |
| Battery electronic | Replace batteries; check terminals | Flat or corroded cells |
| Hydro start | Ensure sufficient tap flow | Low flow or scale at inlet |
If you’re unsure about the ignition type or can’t get the unit to fire, call OnCall Emergency Plumbers on 1800 571 216 for 24/7 Melbourne support. We use quality materials and provide affordable, expert repairs.
When to stop DIY and call OnCall Emergency Plumbers in Melbourne
Recognising when to pause DIY work can prevent bigger problems and safety risks. If you detect a persistent mercaptan odour, hear hissing near the heater or pipework, or suspect a gas leak, stop attempts and call us immediately. If safe, turn the appliance supply off, ventilate the area and move away from the unit.
Persistent smell, hissing, or suspected leak
Smell gas or hear hissing near connections? These signs often mean a fault that requires a licensed gas fitter. We attend urgently and isolate the supply, test for leaks and secure the area.
Repeated pilot failures, no burner ignition, or visible leaks
If the pilot keeps dropping out, the burner won’t ignite after correct checks, or you see rusting, pooling or dripping, stop further tests. Continued troubleshooting can worsen issues or void warranties. We diagnose thermocouples, valves and ignition systems safely.
Older systems, warranty concerns, or unclear instructions
Units nearing ten years or with unclear maker instructions often need professional assessment. We advise on repair versus replacement and protect warranty terms by using approved parts and methods.
Why choose us
- 24/7 Melbourne response with experienced, licensed plumbers for emergency plumbing and general work.
- We use quality materials from reputable brands and offer fair pricing.
- We assess whether repair or replacement gives better value and explain options clearly.
For immediate help and interim safety steps, call OnCall Emergency Plumbers on 1800 571 216. For routine and specialist services see our services page.
Pro tips to keep your gas hot water system working reliably
A little planned upkeep helps your system run smoothly year after year. Regular maintenance reduces the risk of sudden breakdowns and keeps performance efficient.
Follow manufacturer instructions and schedule regular maintenance
We follow maker guidance and set a service calendar that matches warranty rules. Scheduled maintenance keeps parts working and avoids voiding cover.
Watch for early signs of problems
We monitor for fluctuating temperature, discoloured water and unusual noises. These early signs often point to scale, thermostat drift or restricted flow.
- Set a maintenance calendar to fit the manufacturer’s intervals and stick to it.
- Check the thermostat regularly so tap temperatures remain stable.
- Keep the area around the heater clear and well ventilated for safe access.
- Test hot taps for steady flow and note any pulsing or lag that could signal a problem.
- Avoid DIY on sealed controls; book professional servicing to protect safety and warranty.
| Check | When | Why it matters |
|---|---|---|
| Thermostat function | Every 6–12 months | Ensures stable temperatures and efficient running |
| Flow and tap test | Quarterly | Detects inlet blockages and low flow before failures |
| Visual inspection | Every service visit | Finds leaks, corrosion and loose fittings early |
For scheduled maintenance or if you notice early warning signs, reach out to OnCall Emergency Plumbers in Melbourne on 1800 571 216. We offer affordable servicing using quality materials from trusted brands.
Conclusion
Wrap up, we suggest one last quick check of supply, settings and any visible faults before calling for help.
Confirm the pilot light and pilot are steady on tank systems and follow maker instructions exactly when relighting. For instantaneous units, check power and minimum flow so the burner can fire.
Persistent pilot dropouts, suspected thermocouple or valve faults, or clear leaks mean you should stop and call a licensed plumber. If your hot water is still not working, the unit may need professional diagnosis or replacement.
For fast, 24/7 assistance in Melbourne call OnCall Emergency Plumbers on 1800 571 216. We’ll get your hot water working safely using quality parts and fair pricing.
FAQ
What quick checks can we do before calling a plumber when our gas hot water stops working?
We first confirm the gas supply valve is open and other gas appliances are operating. Next, we check the pilot and ignition, look for visible leaks around the tank and fittings, and test a tap to verify flow and temperature. If the unit uses power, we inspect power sources and batteries. These simple steps often identify easy-to-fix issues.
What are the common causes when a gas unit stops producing hot water and how will we approach diagnosis?
Typical causes include a failed pilot or ignition system, blocked burner, faulty thermocouple, power or battery faults on continuous-flow units, or leaks. We start with safety checks, confirm ignition and flow, then isolate whether the problem is mechanical, electrical, or related to fuel supply before advising repair or replacement.
If we smell gas, what should we do immediately?
We evacuate the area, ventilate by opening windows and doors, and avoid operating electrical switches. We then turn off the main supply at the meter if it is safe to do so and call emergency services and the gas provider. We do not attempt repairs ourselves when a smell or suspected leak is present.
How do we check the pilot light on a storage tank unit?
We locate the access cover and follow the manufacturer’s instructions. With controls off, we wait a few minutes, set the control to pilot, press and hold the control while using the ignition, and confirm a steady blue flame. If the pilot won’t stay lit, the thermocouple or gas control may need attention.
What should we try if the pilot flame keeps going out?
We inspect for drafts, debris in the burner area, or a faulty thermocouple. Cleaning around the pilot and burner can help, but repeated failures usually indicate component wear. At that point we recommend a tradesperson to test and replace the thermocouple or gas valve as required.
How do we approach ignition and flow checks on instantaneous or continuous-flow systems?
We identify the ignition type — electronic 240V, battery, or hydro start. We check mains power, fuse and RCD, fresh batteries where fitted, and ensure minimum tap flow to trigger the burner. If the unit won’t ignite despite power and flow, electrical or control board faults may be present.
What visible signs indicate we should stop DIY and call OnCall Emergency Plumbers in Melbourne?
We call immediately for a persistent smell of gas, hissing noises, visible leaks, repeated pilot or ignition failures, or where system age or warranty concerns exist. We also recommend professional assistance if instructions are unclear or if relighting attempts don’t resolve the issue.
Why choose OnCall Emergency Plumbers in Melbourne for gas hot water issues?
We provide 24/7 emergency response, experienced technicians, quality replacement parts and fair pricing. Our team follows safety protocols and offers transparent advice on repair versus replacement. Call us on 1800 571 216 for prompt service.
What pro maintenance tips help keep a gas hot water system reliable?
We follow manufacturer servicing schedules, remove flammable materials from around the unit, inspect for leaks and corrosion regularly, check pressure relief valves, and replace batteries before they fail. Early attention to fluctuating temperature, discoloured supply or unusual noises reduces breakdown risk.
