How Often Should Commercial Fridges Be Serviced? A PPM Guide for Multi-Site Operators

Ask ten refrigeration firms how often a commercial fridge should be serviced and nine will say twice a year. It is a reasonable default and it is also the answer you give when you do not know what the equipment is doing. A blast chiller in a production kitchen and an undercounter bottle fridge in a quiet members' bar are both commercial refrigeration, and putting them on the same schedule means one is over-serviced and the other is under-serviced.

On a single site that inefficiency is small. Across forty sites it is a budget line. This is how frequency is actually decided, and how the two schedules you are legally obliged to run fit alongside the one you choose.

Three schedules, not one

The confusion here is structural. Most operators think of "servicing" as one thing. It is three, they have different drivers, and they only sometimes land on the same visit.

Schedule	Driven by	Discretionary?
Planned maintenance (PPM)	Equipment type, duty, environment, criticality	Yes, you choose
F-Gas leak checking	Refrigerant charge in tonnes CO₂e	No, set in law
Food safety verification	Your HACCP plan and the risk of the product	Structured by law, detail is yours

A well-built programme aligns them so an engineer is not making three separate trips. A badly built one leaves the leak check schedule as an assumption and only discovers the gap during an audit. If you are also reviewing the commercial terms, our breakdown of what a refrigeration maintenance contract actually covers deals with the cover levels and exclusions rather than the frequencies.

The one that is not up to you: F-Gas leak checks

Start here, because this frequency is fixed and everything else can be arranged around it. Article 4 of the retained F-Gas Regulation sets the intervals by refrigerant charge expressed in tonnes of CO₂ equivalent, not by weight of gas:

Charge	Minimum frequency	With automatic leak detection fitted
5 to under 50 tonnes CO₂e	At least every 12 months	At least every 24 months
50 to under 500 tonnes CO₂e	At least every 6 months	At least every 12 months
500 tonnes CO₂e or more	At least every 3 months	At least every 6 months

The trap is the units. Two systems holding identical weights of refrigerant can fall into different bands, because CO₂e is the charge weight multiplied by the refrigerant's global warming potential. A system holding 5kg of a high-GWP refrigerant can exceed a threshold that a system holding 10kg of a low-GWP one does not reach. If nobody has done that calculation for your estate, nobody knows your correct frequencies, and "we service everything annually" may not be compliant.

Our guide to the UK F-Gas rules for businesses goes through the calculation and the wider obligations.

The one you choose: planned maintenance frequency

For PPM, the honest starting point is that frequency should follow four things: what the equipment is, how hard it works, what environment it sits in, and what happens if it stops.

Equipment type and duty

Some kit is simply harder on itself. A blast chiller pulls product through a large temperature swing repeatedly, so its components see far more thermal cycling than a static storage fridge. An ice machine handles water continuously, which means scale and hygiene, not just refrigeration. A cellar cooler runs against a constant heat gain from the building.

Equipment	Typical PPM frequency	Why
Walk-in cold room / freezer room	2 to 4 visits a year	High stock value, door traffic, evaporator icing, panel and seal wear
Blast chiller	2 to 4 visits a year	Heavy thermal cycling, high duty, food safety critical
Ice machine	2 to 4 visits a year	Scale, water hygiene, filter changes as much as refrigeration
Cellar cooling	2 visits a year, before and after summer	Seasonal load swing, product quality directly affected
Retail display cabinets	2 to 4 visits a year	Open fronts, ambient dependency, trade-critical
Back-of-house storage fridge	1 to 2 visits a year	Steady load, lower stock value, easy to substitute
Condensing units and packs	2 to 4 visits a year	Condenser fouling drives efficiency and compressor life

Treat those as starting points that a survey then adjusts, not as a specification. A back-of-house fridge in a site with a fryer next to it needs more attention than the table suggests.

Environment

This is the factor most often ignored and it moves the answer more than equipment type does. Condensers in a hot, greasy or dusty location foul faster, and a fouled condenser raises head pressure, which increases energy consumption and shortens compressor life at the same time. A kitchen extract discharging near a condenser will halve the useful interval between cleans. So will a plant area next to a busy road.

Criticality

Ask what a failure costs at that specific asset. If the answer is a closed counter on a Saturday, service it more often. If it is moving twenty kilos of stock to the fridge next door, service it less. Estates rarely make this distinction and it is where the efficiency is. Our framework for costing refrigeration downtime gives you a way to put a figure against each asset rather than a feeling.

What SFG20 adds

If you want an independent reference rather than a contractor's opinion, SFG20, published by BESA, is the standard the FM industry works to. It carries over eighty air conditioning and refrigeration task schedules covering chillers, cold rooms and food storage, compressors, condensers, control panels and more, and each schedule specifies the task, the frequency, the skill level required and how critical the task is, using a colour-coded criticality system.

Two practical uses for it. First, it settles arguments about what a planned visit should contain, because the task list is written down by someone with no commercial interest in your contract. Second, the schedules are updated as legislation changes, so referencing them keeps a long contract from drifting out of date.

You do not need an SFG20 licence to benefit. Asking each bidder to map their visit content against the relevant schedules tells you a great deal about the depth of what they are quoting.

What should actually happen on a visit

A planned refrigeration visit that takes twenty minutes has not happened. As a rough guide, here is what a proper visit on a typical commercial system covers.

• Condenser cleaned and the fins checked for damage. This is the single highest-value task on the list.
• Evaporator inspected for icing, airflow obstruction and drain condition.
• Operating pressures and temperatures recorded, superheat and subcooling checked against expected values. Recorded, not just eyeballed, so the next engineer has a trend to compare against.
• Electrical checks on contactors, terminals and current draw. Rising amps on a compressor is an early warning that costs nothing to spot.
• Controls and defrost verified, including that defrost termination is actually working rather than running to time-out every cycle.
• Door seals, hinges and closers checked. Boring and responsible for a large share of temperature complaints.
• Drainage and heater tapes checked, particularly on freezers where a blocked drain becomes an ice problem quickly.
• Leak check performed and recorded where the asset falls in scope.
• A written report with readings, not a signed sheet that says "system OK".

That last point is the one to insist on. A visit that produces numbers gives you trend data across the estate. A visit that produces a tick gives you nothing you can manage with.

Aligning it all so you are not paying for three visits

Here is the practical sequencing that works on most estates:

1. Build the asset register, including refrigerant type and charge for every system.
2. Calculate CO₂e per system and derive the legal leak check frequency for each.
3. Set the PPM frequency per asset based on duty, environment and criticality.
4. Where the PPM frequency is equal to or higher than the leak check frequency, combine them into the same visit.
5. Where the leak check is more frequent than your chosen PPM, the leak check sets the floor.
6. Schedule seasonally: cellar cooling and anything ambient-sensitive gets attention before summer, not during it.

Step six matters more than it sounds. Booking pre-summer visits in April is the difference between finding a marginal condenser at your convenience and finding it during the first hot week, along with everyone else in London.

Signs your current frequency is wrong

• You are getting reactive callouts on assets that were serviced within the last two months. The visits are too shallow, not too infrequent.
• Refrigerant is being added at most visits. That is a leak going unrepaired, and it means the leak check regime is not doing its job.
• Reactive spend clusters into July and August. Your schedule is not seasonally aligned.
• Nobody can tell you the CO₂e charge of your largest system. The compliance frequency is unknown, which means it is probably wrong.
• Service reports contain no numbers.

The short answer

Twice a year is a defensible default for general commercial refrigeration in a clean environment with moderate duty. Increase it for high-duty equipment, harsh environments and trade-critical assets. Decrease it only where the failure consequence is genuinely low. And in every case, check whether F-Gas sets a floor beneath the frequency you have chosen, because that one is not a matter of opinion.

If you would like someone to survey a sample of your sites and build the schedule properly, including the CO₂e calculation, that is the sort of thing we do before quoting planned refrigeration servicing. You can also look at our cold room repair work or ask us for a quote.

About the author: Ali Elm runs Be Cool Refrigeration & Air Conditioning, a family-run London firm that has been installing, servicing and repairing commercial refrigeration and air conditioning since 2004. His F-Gas certified team has delivered more than 2,000 projects across London and the South East.