No Hot Water? Here's Why — and How We Fix It Fast
Woke up to no hot water? When hot water stops working completely it's almost always one of a few faults — and most are a quick repair, not a new system. Here's what's likely, what you can check, and how we get it back on.
Why your hot water stopped working
When your hot water is not working at all — stone cold, no warmth — the system has stopped heating entirely. On an electric unit that usually means a failed element or thermostat, a tripped breaker, or an off-peak supply issue; on a gas unit it's typically a pilot that's gone out, a thermocouple, or a gas-supply problem. It's rarely the tank itself, which is why hot water that has stopped working is usually a repair rather than a replacement. Whether you'd call it a water heater not working or simply the hot water not turning on, the causes are the same.
The good news: a hot water system not working completely is one of the faster faults to diagnose, because the unit gives us clear signals. Tell us whether it's gas or electric and what you've noticed, and we'll arrive with the likely parts.
What's probably causing it
Ranked by how often we see it — tell us which sounds like yours and we'll come prepared.
Tripped power or failed element (electric)
The most common electric cause — a tripped breaker, a burnt-out heating element, or a failed thermostat that's stopped the tank heating.
Pilot out or thermocouple (gas)
On gas, the pilot light going out or a faulty thermocouple stops the burner firing, so the water never heats.
Off-peak / controlled load (electric)
If you're on off-peak and the unit only heats overnight, a controlled-load fault or an exhausted tank can leave you cold by evening.
Gas supply issue
No gas to the unit — an isolation valve turned off, a supply fault, or an empty LPG bottle — means no hot water even though the unit is fine.
Thermostat or ECU fault
A failed thermostat (storage) or control board (continuous flow / heat pump) can stop the system heating despite power and gas being present.
Line attended 24 hours · no-hot-water call-outs prioritised across Sydney.
What's safe to check — and what isn't
A few checks are safe for anyone; the rest is a licensed gas or electrical job.
What's safe to check yourself
- Is the power point on, and has the breaker tripped? (electric)
- Is the gas on, and is the pilot lit per the manufacturer? (gas)
- Has an off-peak unit simply run out for the day?
- Any obvious leak or error code to tell us about
If a reset or relight doesn't hold, stop there — it points to a fault that needs a licensed repair.
When to call a licensed pro
- The breaker trips again after resetting
- The pilot won't stay lit after relighting
- You smell gas (turn gas off, don't use switches, call)
- Any element, thermostat, gas-valve or wiring work
Gas and electrical hot water repairs must be done by a licensed tradesperson.
How we get your hot water back on
The licensed repair, and the fastest path back to hot water.
We diagnose the actual fault on site — element, thermostat, thermocouple, gas valve or supply — quote the repair before we start, and carry the common parts so most no-hot-water calls are fixed in one visit. If it's a gas-specific fault, our gas not working guide has the detail; if the tank itself has failed, we'll show you replacement options rather than a repair that won't last.
The line is attended 24 hours and we prioritise no-hot-water call-outs, so calling is the quickest way to find out when we can be there.
See also: book a repair · gas not working? · replace it instead
No Hot Water? Causes & How We Fix It Fast questions, answered
If yours isn't here, call — the line's attended 24 hours.
Why has my hot water stopped working?
Is no hot water an emergency?
Why is my electric hot water not working?
Can you fix no hot water the same day?
Should I try to fix it myself?
Is it cheaper to repair or replace?
Tell us what's happening — we'll fix it
Call the 24-hour line with your suburb and the symptom, or request a quote. We prioritise no-hot-water call-outs and come prepared with the likely parts.