Most commercial kitchen breakdowns are preventable, and four jobs prevent the majority of them: clean the condenser, clean and check the door seals, descale anything that heats water, and clear the filters. Run those on a written schedule — daily, weekly, monthly and quarterly — and you will cut both your call-out bill and your unplanned closures.
📋 What this guide covers
- A daily, weekly, monthly and quarterly schedule
- The condenser: the single most neglected part in any kitchen
- Descaling anything that heats water
- Door seals, filters and drains
- Five common faults and how to check them yourself
- When to stop and call a technician
1. The maintenance schedule
Write it down and put it on the wall. Maintenance that lives in someone's head does not happen.
| Interval | Tasks |
|---|---|
| Daily | Wipe down all surfaces. Empty and clean fryer baskets and crumb trays. Backflush the coffee machine. Clean dishwasher filters and wash arms. Empty grease traps in the extraction canopy filters as required. Check and log fridge and freezer temperatures. |
| Weekly | Deep clean canopy filters. Clean behind and under equipment. Filter or change fryer oil. Clean door seals with warm soapy water. Flush floor drains. Check that nothing is blocking equipment vents. |
| Monthly | Clean refrigeration and ice machine condensers. Check door seals for splits and poor closure. Descale the dishwasher, coffee machine and boiling water units. Check ice machine and fridge drains are running clear. Test thermometers against a known reference. |
| Quarterly / scheduled | Professional service on refrigeration, gas equipment and extraction. Replace water filter cartridges. Sharpen or replace blades. Check gas equipment flame pattern and ignition. Review and reset the temperature calibration. |
2. The condenser is the one job people skip
Every fridge, freezer and ice machine has a condenser coil that has to shed heat. In a commercial kitchen it fills with grease-laden dust within weeks.
A blocked condenser makes the compressor work harder, raises your power bill, pushes the cabinet out of temperature and shortens the machine's life dramatically. It is also a ten minute job with a brush and a vacuum.
If you do only one piece of maintenance in this whole guide, do this one, monthly, on every refrigerated unit you own.
🔧 Pro tip, isolate the power first
Switch off and unplug before you touch a condenser, a fan or any panel. Fans start without warning when a thermostat calls, and a spinning fan blade and a hand do not mix.
3. Descale anything that heats water
Dishwashers, glasswashers, coffee machines, boiling water units, combi ovens and ice machines all heat or freeze water, and all of them accumulate scale.
Scale acts as insulation on a heating element, so the machine works harder, takes longer and eventually fails. On a dishwasher it also leaves streaked glassware, which staff usually blame on the detergent.
Use the descaler the manufacturer specifies, at the interval they state, and adjust that interval to your local water hardness. A water filter reduces how often you need to do it but does not remove the need. See water filters and dishwashing chemicals.
4. Door seals, filters and drains
Door seals perish, split and go hard. A seal that no longer closes properly lets warm moist air into a fridge continuously, which shows up as ice build-up, high running costs and food that does not last. Clean them weekly with warm soapy water — grease is what degrades them — and check for splits monthly.
Filters exist in more places than people think: extraction canopies, dishwashers, ice machines, water lines and fryer oil systems. Every one of them is designed to be removed and cleaned or replaced.
Drains block with grease and food debris. A blocked ice machine drain overflows into the cabinet; a blocked fridge drain pools water in the base and freezes. Flush them on schedule rather than waiting for the puddle.
5. Five common faults, and what to check first
| Symptom | Check first |
|---|---|
| Fridge not holding temperature | Blocked condenser, perished door seal, blocked vents inside the cabinet, overloading, or warm product loaded in. |
| Dishwasher leaving film or streaks | Scale build-up, blocked wash or rinse arm jets, dirty filters, incorrect detergent or rinse aid dosing, or low rinse temperature. |
| Ice machine producing little or cloudy ice | Scaled evaporator, exhausted water filter, blocked condenser, or ambient temperature above the machine's rating. |
| Oven cooking unevenly | Failed door seal, blocked fan, overloaded shelves blocking airflow, or a thermostat that has drifted out of calibration. |
| Fryer oil breaking down fast | Temperature set too high, food debris left in the oil, poor filtration routine, water entering the oil, or oil left at temperature during quiet periods. |
ℹ️ Check the simple things before you call
A large share of paid call-outs turn out to be a blocked filter, a tripped switch, a door not closing or a machine that was never turned back on. Run through the basics and note what you found — it makes the technician's visit shorter and cheaper if you do need one.
6. When to stop and call a technician
Stop and call a licensed professional for anything involving gas, fixed electrical work, refrigerant, or a machine that has tripped a safety device more than once. Do not reset a repeatedly tripping circuit and carry on, and never bypass or defeat a safety interlock.
Keep a log of every fault and every service. A pattern in that log is often the clearest evidence of what is really going wrong, and it strengthens any warranty claim.
7. Make it someone's job
Maintenance fails when it belongs to everybody. Assign each task to a role, put it on the cleaning roster with a tick box, and check the sheet weekly. Browse cleaning and hygiene supplies.
Final thoughts
Commercial kitchen equipment rarely fails without warning. It gets slowly starved of airflow, coated in scale or run with a seal that stopped sealing months ago. A written schedule, an assigned owner and ten minutes a day will keep most of your fleet out of the repair queue.
Frequently Asked Questions
Monthly is a sound default for a commercial kitchen, because condensers fill with grease-laden dust quickly. Isolate the power first, then brush and vacuum the coil. A blocked condenser raises running costs, pushes the cabinet out of temperature and shortens the compressor's life.
Usually scale build-up or blocked wash and rinse jets rather than the detergent. Check and clean the filters and the wash arms, descale the machine, and confirm detergent and rinse aid dosing and rinse temperature are correct for your water.
Usually a door seal that no longer closes properly, letting warm moist air in continuously. Clean the seals with warm soapy water weekly and check monthly for splits and hard spots. A door left ajar during service and a blocked drain cause the same symptom.
Filter it on a routine, skim food debris out during service, avoid setting the temperature higher than the product needs, keep water out of the oil, and drop the temperature or switch off during long quiet periods. Debris and excess heat are what break oil down fastest.
Always for anything involving gas, fixed electrical work or refrigerant, and for any machine that trips a safety device more than once. Never bypass a safety interlock or repeatedly reset a tripping circuit. Cleaning, descaling, filters and seals are safe in-house tasks.
