A commercial oven that will not reach temperature is nearly always supply, a door switch, thermostat calibration or a failed element or gas valve, and while it is down you cannot reheat food to the 60C the Food Standards Code requires.
Skai Solutions answers the phone for restaurants, cafes and takeaways in Australia and New Zealand, which is how we hear this one: mid service, from a kitchen that has just taken four dishes off the board. Most pages on this symptom are written for domestic ovens or for American repair companies. This one is written for a commercial oven in an Australian or New Zealand kitchen, and it starts with the checks that cost nothing.
Not the repair. The repair is the small number. The cost is the menu. A fridge that fails gives you a few hours of grace and a dishwasher that fails gives you a sink. An oven that will not come up to temperature takes items off the board in the middle of a service, and it takes the slowest, highest margin ones first, because those are the ones that need a long hold at a real temperature.
Work it on your own numbers. Count the dishes on your menu that cannot leave the kitchen without that oven, multiply by what they sell for and by how many you normally do in a service. Then add the two costs nobody counts: the covers you turn away because the kitchen cannot hold the pace, and the food already prepped for those dishes that now has a clock on it.
Before you touch anything, write down three things, because they are what makes the diagnosis quick. Does it heat at all, or not at all? Did it stop mid service or fail to start cold this morning? And is it gas or electric? Those three answers eliminate most of the list below in about a minute.
There are six real answers and they fail in a predictable order. Four of them cost nothing to check.
| What you see | Usually | Check |
|---|---|---|
| Completely dead, no fan, no display | Supply, not the oven | The isolator on the wall, the breaker or RCD at the board, and whether anything else on that circuit died with it |
| Gas oven, igniter clicks or glows, no flame | Gas supply or the safety circuit | Isolation valve fully open, other gas appliances working, and on LPG whether the cylinder is low or the regulator has iced |
| Runs, fan turns, never gets hot | Failed element, or a gas valve not opening | Whether any element glows at all, and whether the oven ever reaches a lower set point |
| Heats, but slowly and never to the dial | Thermostat calibration or a tired element | A probe thermometer in the cavity against the dial after 20 minutes |
| Cuts out partway, or only heats with the door held | Door switch or a sagging seal | The microswitch in the frame and whether the gasket still compresses evenly |
| Trips the board every time | A failed element shorting to earth | Stop. This is electrical work, not troubleshooting |
The row that catches people is the fourth. An oven that reaches 140 when the dial says 180 is not broken in the way the kitchen thinks it is. It is lying, and it has probably been lying for weeks, which means the cooking times your team has quietly been extending were the first symptom. That is also the row with a compliance tail, which is the next section.
For cold and fresh food, yes. For anything you reheat or hot hold, read this first. Food Standards Australia New Zealand requires potentially hazardous food to be kept at 5C or colder, or 60C or hotter, at all times, including during display. The list of potentially hazardous food includes the things usually left out of staff training: cut fruit and vegetables, cooked rice, and fresh or cooked pasta.
Reheating is stricter still. FSANZ's position on cooling and reheating food is that food being reheated for hot holding must be heated quickly to 60C or hotter, ideally within two hours, and that it should not be done in bain maries or pie warmers. An oven that takes an hour to crawl to 140C is not a reheating device, and the bain marie you were about to use instead is explicitly not one either. The same guidance says to avoid reheating the same food more than once.
So the honest operational answer on a day the oven is sick is to stop reheating, serve what you can cook fresh or serve cold, and dump what has already sat. If you are unsure how long something has been out, our page on the two hour four hour rule has the guide FSANZ actually publishes, and the mandatory two stage cooling clause that is often confused with it.
One more duty that becomes relevant the moment a thermostat is suspect. Standard 3.2.2 requires a food business handling potentially hazardous food to have an accurate, accessible thermometer. On the day the oven is misreading, that thermometer stops being a compliance item in a drawer and becomes the only instrument in the building telling you the truth.
This is where an oven differs from every other machine in your kitchen, and it is the part the overseas repair blogs do not carry because the rules are ours.
If the oven is gas, servicing and repair is licensed work. In Victoria, gas servicing must follow AS 4575, the standard for servicing Type A appliances, and the Plumbing Industry Commission's own wording is that only plumbers who are registered or licensed in the specialised class of Type A appliance servicing may carry it out, with a registered person working under the supervision of a licensed Type A servicer. The gasfitter must produce a servicing record including the Appendix E checklist, give you a complete copy within five days, and keep the record for ten years. That record is yours, it is evidence, and most operators never ask for it.
The same regime names what counts as safety critical non compliance in plain words: gas leaks, spillage of combustion products, and overheating or scorching of surfaces. If a gasfitter finds any of those, the installation must be made safe immediately, and where carbon monoxide spillage cannot be made safe, Energy Safe Victoria must be notified on 1800 652 563. If you have been smelling gas near an oven that will not light, that is not a heating fault to troubleshoot. Shut the isolation valve and call a gasfitter.
If the oven is electric and it trips the board, the same logic applies with a different trade. An element that shorts to earth will keep tripping the circuit, and resetting a breaker repeatedly on a kitchen appliance is how a small fault becomes a fire. Our page on commercial kitchen fire suppression covers what the Building Code actually requires above a cooking line.
Three questions to ask whoever comes. Is the fault the element, the control or the supply. Is the part available in the country or on indent. And is the appliance inside any remaining warranty, because on a cooking appliance the sealed and gas components often carry different terms from the shell.
Ovens almost never fail without notice. They drift. The venue that gets caught is the one where nobody was measuring, so the drift showed up as longer cooking times rather than as a fault. Two habits fix that, and both are free.
Put a probe reading in the opening checklist once a week, oven set to one fixed temperature, and write the number on the same sheet as your fridge temperatures. Three months of that and you can see a thermostat going before it goes. Second, book the gas service and keep the Appendix E checklist in the same folder as your food safety records, because the day you need to prove the appliance was maintained is the day it has already failed.
And treat the pattern as information. An oven that fails twice in a season is telling you something a third repair will not fix, the same way a fridge that will not hold temperature or a dishwasher that keeps failing is. Price the replacement before you authorise the repair, not after.
The two hours a manager spends on hold to a service company are two hours of a trading day when the phone is ringing out, and the calls that go unanswered are bookings and orders. Skai Solutions answers the phone for restaurants, cafes and takeaways in Australia and New Zealand, takes the booking or the order and puts it where your team will see it, with setup taking about five days. If your phone mostly carries supplier calls rather than bookings, a basic message-taking plan is the right buy and it is not us.
Why is my commercial oven not heating up?
Six faults cover almost every case: supply, gas supply or the safety circuit, a failed element or gas valve, thermostat calibration, a door switch or flat gasket, and an element shorting to earth. Start by answering three questions. Does it heat at all. Did it fail cold this morning or stop mid service. Is it gas or electric. Those three answers remove most of the list in about a minute.
My oven heats but never reaches the temperature on the dial. Is that a fault?
Usually calibration or a tired element, and it matters more than it sounds. Put a probe thermometer in the centre of the cavity, set the oven to 180 and read it at 20 and 40 minutes. A gap of about 30 degrees points at the thermostat. It has probably been drifting for weeks, and the longer cooking times your team quietly adopted were the first symptom.
Can I keep serving while the oven is not working?
Cold and fresh food, yes. Reheated or hot held food, no. FSANZ requires potentially hazardous food to be at 5C or colder or 60C or hotter at all times, and food reheated for hot holding must be heated quickly to 60C or hotter, ideally within two hours, and not in bain maries or pie warmers. An oven crawling to 140C cannot do that, so stop reheating rather than working around it.
Can I repair a commercial gas oven myself?
No. Gas servicing and repair is licensed work. In Victoria it must follow AS 4575 and the Plumbing Industry Commission states that only plumbers registered or licensed in the specialised class of Type A appliance servicing may carry it out. The gasfitter must give you a servicing record including the Appendix E checklist within five days and keep it for ten years.
I can smell gas near the oven and it will not light. What should I do?
Stop troubleshooting. Shut the gas isolation valve and call a licensed gasfitter. Gas leaks, spillage of combustion products and overheating or scorching of surfaces are named as safety critical non compliance, which must be made safe immediately, and where carbon monoxide spillage cannot be made safe, Energy Safe Victoria must be notified on 1800 652 563.
My oven keeps tripping the breaker. Can I just reset it?
Not repeatedly. An element shorting to earth will trip the circuit every time, and resetting a breaker on a kitchen appliance over and over is how a small fault becomes a fire. Leave it isolated and get an electrician to it, especially if the trip takes out other equipment on the same circuit.
What should I tell the technician when I call about an oven?
The model and serial from the plate, whether it is gas or electric, the two probe readings at 20 and 40 minutes, and whether it failed cold or mid service. A specific symptom gets the right part brought on the van. A vague one gets a diagnostic visit and a second appointment days later. Ask whether the appliance is still in warranty before you authorise anything.
How often should a commercial oven be serviced?
Set the interval with your gasfitter or technician rather than from a generic schedule, and keep the record. The habit that actually prevents this fault costs nothing: take one probe reading a week at a fixed set point and log it beside your fridge temperatures. Three months of readings shows a thermostat drifting before it fails during a service.