The short answer
A Brigade gas oven that will not reach temperature is usually failing to hold its flame, being starved of gas, or losing its heat to a door that no longer seals. Check the supply and the door first. A dirty or failed flame supervision device and burner adjustment are gas work and belong to a registered engineer.
What you observe
- The burner lights then goes out after a few seconds — A flame supervision device not proving the flame.
- It heats slowly and never reaches the set temperature — A weak flame, a poor door seal or a fan not running.
- One shelf cooks and another does not — The convection fan rather than the burner.
- Nothing happens at all when it is called for — No gas, an isolator off, or a control fault.
- NEAR MISS - a long recovery after a busy door-opening period — Normal on a working line.
Causes, most likely first on this brand
- A flame supervision device not proving the flame — First on any commercial gas oven. Soot on the probe, a loose connection or a worn device means the valve closes seconds after lighting, so the oven lights and dies repeatedly rather than failing outright.
- Gas supply restricted or isolated — Second, and often nothing to do with the oven. A closed isolation valve after a clean, a supply shared with a busy range, or work elsewhere on the line all present exactly as an oven that will not heat.
- A door seal or hinge letting heat out — Third. A commercial door takes constant knocks, and a rope seal that has flattened or a hinge that has dropped loses enough heat that the oven never reaches setpoint during service.
- A convection fan not running — Fourth. The oven may be making heat but not distributing it, which shows as uneven cooking rather than a cold cavity.
- A thermostat, control or burner adjustment fault — Last. All of these are gas-safe work and none is an owner adjustment on commercial equipment.
Check in this order, and why
- Watch what happens after it lights — Lighting then dying points straight at flame supervision.
- Check the gas isolation valve is open — Easy to close during a clean and easy to forget.
- Check other gas equipment on the line — If everything is weak, the supply is the question.
- Listen for the convection fan — No fan means uneven cooking even with a good burner.
What an owner can safely check
- Confirm the gas isolation valve is open — Check the valve serving the oven and any other equipment on the same line.
About 10 min
- Clean the door seal and check the hinges — Degrease the seal face and look for a flattened rope or a dropped door.
Tools: degreaser, clothAbout 25 min
- Clean the cavity and the fan guard — Baked-on grease around the fan restricts the air the oven relies on.
Tools: degreaser, clothAbout 40 min
- Note the exact behaviour for the engineer — Whether it lights and dies, or never lights, saves a visit.
About 10 min
- STOP HERE at anything involving the burner or the gas train — That is registered gas work.
Before you open anything
Safety
If you smell gas, do not touch any switch, do not use a light, leave the building and call the gas emergency number from outside. Never attempt to clean, adjust or bypass a flame supervision device, a burner or a gas valve: these are the components that stop unburnt gas entering a kitchen, and work on them is for a registered engineer only. Isolate the oven at its gas valve and its breaker before cleaning.
When to call a technician
Call a registered gas engineer when the isolation valve is open, the door seals and the cavity are clean and the oven still lights and dies, will not light, or never reaches temperature. Tell them exactly what it does, because lighting and dying points at flame supervision while never lighting points elsewhere. Call the gas emergency number instead, from outside, for any smell of gas.
Nearest pages of this class
What this page does not cover
This page covers the Brigade commercial gas convection ovens on catering lines. Electric convection and combination ovens have no gas train, no flame supervision and a different fault list. Deliberately absent: burner and valve part identifiers, gas pressures, temperature figures, flame supervision specifications and commissioning data, all of which belong to a registered engineer.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
