Troubleshooting Common Combi Oven Issues

When your combi oven acts up mid-service, it can throw your entire kitchen into chaos. While modern combi ovens are reliable workhorses, they still require regular maintenance, and occasionally, some hands-on troubleshooting.

Below, we break down the most common combi oven issues, why they happen, and how to fix them fast (or know when to call in the pros).

Oven Not Heating Properly

Symptoms:	Possible Causes:
Oven doesn't reach set temperature	Heating elements or steam generator failure Door seal damage (heat escaping)
Slow cooking times	Temperature sensor fault
Uneven results	Limescale build-up affecting steam production

What to Try:
✅ Check the door gasket for cracks or warping
✅ Run a descaling cycle if you haven't recently
✅ Confirm the oven is correctly set to the desired cooking mode (steam, convection, combi)
❌ Don’t attempt to repair internal heating components unless qualified

No Steam or Weak Steam Output

Symptoms:	Possible Causes:
Food dries out during combi cooking	Water supply issue
Steam mode ineffective	Scale build up in boiler or injection system Blocked or dirty steam inlets
Uneven results	Faulty solenoid valve

What to Try:
✅ Check water line and filters
✅ Run automatic descaling (if available)
✅ Clean or inspect the steam outlets
✅ Reset the oven to factory defaults if settings were changed

Pro Tip: Poor water quality = more maintenance issues. Consider a water treatment system

Oven Won’t Start or Keeps Shutting Off

Symptoms:	Possible Causes:
No power	Blown fuse or circuit breaker
Random shut-offs	Overheating protection activated
Display frozen or blank	Electrical fault or moisture in controls

What to Try:
✅ Turn the oven off, wait 1–2 minutes, and restart
✅ Check for tripped breakers or loose plugs
✅ Let the unit cool fully before restarting
✅ If in a high-moisture environment, inspect for water ingress

⚠️ Persistent shutdowns = time to call for servicing.

Self-Cleaning Cycle Won’t Run Properly

Symptoms:	Possible Causes:
Cleaning doesn’t complete	Empty detergent tank
Soap not dispensing	Clogged nozzles or drain
Error messages during cycle	Sensor faults or blocked filters

What to Try:
✅ Refill detergent and rinse tanks
✅ Clean spray arms and filters manually
✅ Ensure the door seal is tight before starting
✅ Double-check that the correct cleaning program was selected

Strange Noises During Operation

Symptoms:	Possible Causes:
Whining, rattling, or banging sounds	Fan obstruction or worn bearings Loose trays or racks
Steam hissing excessively	Excessive scale causing steam pressure fluctuations

What to Try:
✅ Make sure all internal racks and trays are seated properly
✅ Inspect fan area for blockages (after unplugging)
✅ Schedule a service to inspect mechanical parts if noise continues

Common Error Codes and What They Mean

*Refer to your oven's manual for model-specific codes (Rational, Unox, Lainox, etc.). User manuals can be found on our Resources page.

When to Call the Professionals

If you're experiencing one of the problems below, don’t risk downtime. Contact a certified CaterCombi technician urgently. We offer fast-response support, maintenance contracts, and same-day parts in many areas.

- Repeated error codes
- Electrical faults
- Internal steam leaks
- Persistent heating problems

Prevent Problems Before They Start

Most combi oven issues are preventable with:

- Daily cleaning
- Weekly descaling (if required)
- Routine service checks (every 6–12 months)
- Proper water filtration

Need Support?
Call CaterCombi for expert advice, servicing, or parts replacement. We keep your kitchen running, so you can focus on the food.

Call: 01227 913699  Email: service@catercombi.com