Why Won't My Oven Heat Up?
An oven that won't heat is one of the most frustrating kitchen problems. Whether you have an electric or gas oven, there are several common causes - some you can fix yourself, others require professional help.
Quick Checks First
Before diagnosing complex issues, rule out these simple causes:
- Power supply: Check the plug, socket, and circuit breaker
- Control settings: Ensure correct mode selected (not just grill or light)
- Timer/delay: Check no delayed start is set
- Child lock: Some ovens have child lock that disables heating
- Door not closed: Many ovens won't heat with door ajar
- Demo mode: New ovens may be in showroom mode
Electric Oven Not Heating
Electric ovens are the most common in South Africa. Here are the main reasons they stop heating:
1. Bake Element Burned Out
The most common cause - the heating element at the bottom of the oven.
Signs:
- Element doesn't glow red when oven is on
- Visible damage - blistering, cracks, or holes in element
- Burn marks on the element
- Bottom element doesn't heat but grill element works
DIY Check:
- Turn oven on to bake mode at 180°C
- Wait 2-3 minutes
- Look through the oven window (don't open door)
- Bottom element should glow orange/red
- If no glow but fan is running, element is likely burned out
Repair cost: R450-R950 depending on brand and element type
2. Grill/Broil Element Failure
If your oven bakes fine but won't grill, the top element has failed.
Signs:
- Grill mode doesn't produce heat
- Top element doesn't glow when grilling
- Bake mode works normally
Repair cost: R450-R850
3. Fan Element (Convection Ovens)
Fan-assisted ovens have a circular element around the fan at the back.
Signs:
- Fan runs but no heat
- Oven takes forever to reach temperature
- Uneven cooking (only bottom or grill elements working)
Repair cost: R550-R1,100
4. Thermostat Failure
The thermostat controls when heating elements turn on and off.
Signs:
- Oven doesn't heat at all
- Or - oven overheats and doesn't regulate temperature
- Food burns even on low settings
- Temperature vastly different from setting
Repair cost: R550-R1,200
5. Temperature Sensor (Thermistor)
Digital ovens use a temperature sensor to monitor heat levels.
Signs:
- Error code on display (often F3, F4, or temperature-related)
- Oven doesn't reach set temperature
- Erratic temperature behaviour
Repair cost: R350-R650
6. Thermal Fuse Blown
A safety device that cuts power if the oven overheats.
Signs:
- Oven suddenly stopped working
- May have overheated before stopping
- No power to oven at all
Repair cost: R350-R550
7. Control Board Failure
The electronic brain of modern ovens.
Signs:
- Display shows error codes
- Buttons don't respond properly
- Erratic behaviour - sometimes works, sometimes doesn't
- Often happens after power surges/load shedding
Repair cost: R950-R3,500 depending on brand
Gas Oven Not Heating
Gas ovens have different components that can fail. Here are the common issues:
1. Igniter Failure
Most common gas oven problem - the igniter glows to light the gas.
Signs:
- You hear gas flowing but no flame
- Igniter glows weakly (orange instead of bright orange/white)
- Takes very long for oven to light (more than 2 minutes)
- Igniter doesn't glow at all
DIY Check: Turn on oven in a dark room. If igniter glows but takes over 90 seconds to light, it's weak and needs replacement.
Repair cost: R550-R950
2. Gas Supply Issues
Check:
- Gas bottle not empty (for LPG)
- Gas valve fully open
- Regulator working (try another appliance on same line)
- No kinks in gas hose
3. Safety Valve (Gas Valve)
Controls gas flow to the burner.
Signs:
- No gas smell at all when oven is on
- Stovetop burners work but oven doesn't
Repair cost: R650-R1,200
4. Thermocouple Failure
Safety device that detects if flame is present.
Signs:
- Flame lights but goes out after a few seconds
- You have to hold the knob in for the flame to stay on
Repair cost: R350-R650
Oven Heats But Doesn't Reach Temperature
If your oven heats but never gets hot enough:
- Weak element: Element working but not at full capacity
- Faulty thermostat: Not reading temperature correctly
- Door seal damaged: Heat escaping - check seal condition
- Calibration off: Some ovens can be recalibrated
- Fan not working: In fan ovens, no circulation means poor heating
Oven Door Seal Test
A damaged door seal lets heat escape:
- Close the oven door on a piece of paper
- Try to pull the paper out
- If it slides out easily, the seal needs replacement
- Check the seal for cracks, tears, or hardening
Load Shedding and Your Oven
- Reset the clock/timer - many ovens won't work without time set
- Check for error codes on the display
- If oven trips the power when turned on, control board may be damaged
- Use a surge protector to prevent future damage
Oven Repair Costs in Johannesburg
| Repair Type | Typical Cost (incl. labour) |
|---|---|
| Bake element replacement | R450 - R950 |
| Grill element replacement | R450 - R850 |
| Fan element replacement | R550 - R1,100 |
| Fan motor replacement | R650 - R1,200 |
| Thermostat replacement | R550 - R1,200 |
| Temperature sensor | R350 - R650 |
| Thermal fuse | R350 - R550 |
| Door seal replacement | R350 - R650 |
| Gas igniter replacement | R550 - R950 |
| Gas thermocouple | R350 - R650 |
| Control board (depends on brand) | R950 - R3,500 |
| Door hinge repair | R450 - R850 |
When to Call a Professional
Contact JHB Appliances when:
- You've done basic troubleshooting without success
- You smell gas (gas ovens) - this is urgent
- The oven trips your electrical board
- There are burn marks or unusual smells from inside the oven
- You see sparking or hear unusual sounds
- Error codes appear on the display
- Any repair involving electrical connections or gas lines
Brands We Repair
Our technicians service all major oven brands including: