A commercial oven that won’t heat commonly has an ignition, thermostat, control, or power/gas-supply problem. The fix depends on whether you’re running gas or electric. Before you call, here’s how to narrow it down safely.
Safety first: If you smell gas, stop. Shut off the gas supply, ventilate, and call a technician — do not test or relight anything.
Why won’t my commercial oven heat up?
| Oven type | Symptom | Likely cause |
|---|---|---|
| Gas | No flame, no ignition click | Failed igniter or spark module |
| Gas | Pilot won’t stay lit | Thermocouple / safety valve |
| Gas | Weak or no flame | Gas supply / regulator |
| Electric | No heat, no error | Heating element or contactor |
| Both | Wrong/no temperature | Thermostat or control board |
Gas ovens
Igniter / spark module. Most no-heat gas ovens come down to ignition. If you don’t hear the click or see a spark, the igniter or spark module has likely failed.
Thermocouple / safety valve. If the pilot lights but won’t stay lit, the thermocouple isn’t telling the gas valve it’s safe to stay open — so the valve shuts.
Gas supply. Confirm the gas is on and other gas equipment is working. A regulator or supply issue starves the burner.
Electric ovens
Heating element. A visibly damaged, blistered, or broken element won’t heat. Elements are a common, replaceable wear item.
Contactor. The contactor switches high-voltage power to the elements. A failed contactor means the element never gets power even when everything else looks fine.
Both gas and electric: the thermostat
If the oven heats but to the wrong temperature — or the controls are unresponsive — the thermostat or control board is the usual suspect. A drifting thermostat also quietly ruins food cost and consistency.
When to call a technician
Gas components, high-voltage electrical, and control boards are technician work — and on gas equipment, safety isn’t optional. In ColdPros’ field experience, the most common commercial oven repair calls involve ovens that won’t heat, won’t maintain temperature, or have ignition-related problems. Typical failures include bad igniters, faulty thermostats, failed temperature probes, gas valve issues, and ignition module failures.
If your oven won’t heat during service hours, request same-day service; availability depends on the schedule, location, access, and required parts.
FAQ
Do you repair commercial ovens, or just refrigeration? Both. ColdPros services all commercial kitchen equipment — refrigeration and cooking equipment including ovens, ranges, fryers, and griddles.
What does a diagnosis cost? A flat $125 service/diagnostic fee for commercial appliances. Your tech quotes the repair on-site before any work.
ColdPros repairs commercial cooking and refrigeration equipment across the Denver metro, with same-day service whenever availability permits and stocked parts trucks. Schedule a service call or call (720) 902-8090.