The Commercial Refrigeration Preventive Maintenance Checklist

Most restaurants don't do preventive maintenance on their commercial refrigeration. They do reactive maintenance: something breaks, someone calls a service company, the bill arrives. Then they hope nothing else breaks for a while.

This is the most expensive way to operate refrigeration. Industry data is consistent: restaurants on twice-yearly preventive maintenance plans see 40 to 60% fewer emergency service calls, 25% longer equipment life, and meaningfully lower insurance deductible exposure after refrigeration-caused inventory loss. The PM contract that looks like an expense is actually a substantial cost reducer.

This guide is the actual checklist. What gets done, when, why each item matters, what it costs, and what to look for in a written service contract so the PM you pay for is the PM you actually receive.

Why preventive maintenance pays for itself

Three numbers worth knowing:

1. A 3mm layer of grease on a condenser coil reduces heat rejection by ~40%. The compressor compensates by running harder and hotter. Compressors die from running hot. Twice-yearly coil cleaning extends compressor life by 3 to 5 years.
2. A failed door gasket admits humid air that freezes on the evaporator coil. That's the source of about 30% of all "walk-in not cooling" emergency calls. A $120 gasket replacement is cheaper than a $400 emergency service visit.
3. A 10°F rise in operating temperature roughly doubles equipment failure rates. Hot equipment from neglected condensers, undersized line sets, or restricted airflow operates 10 to 20°F hotter than it should. That's the underlying reason badly-maintained units fail in year 7 while well-maintained units last 18+.

The total economics on a typical mid-sized restaurant with two walk-ins, three reach-ins, and one ice machine:

Scenario	Annual cost
No PM, all reactive service	$2,000 to $4,000 in emergency calls, $800 to $1,500 in lost inventory
Twice-yearly PM contract	$400 to $800 in PM, $200 to $600 in residual reactive calls, near-zero inventory loss

Net savings: roughly $1,800 to $3,500 per year. The PM contract is the single highest-ROI maintenance investment most restaurants will make.

The twice-yearly PM checklist (what should actually happen)

This is the checklist any reputable CFESA-member or NATE-certified service company will follow. It's also what you should expect your service contract to specify in writing.

Spring visit (typically April-May)

Spring service prepares the system for summer's heavy load. Most equipment failures happen in summer when condensers are working hardest, and spring PM catches the problems before they fail under load.

1. Condenser coil cleaning

• Power the unit off
• Vacuum loose debris with a soft-bristle brush
• Apply foaming coil cleaner (CRC CoilShield, Rescue, or equivalent)
• Rinse with low-pressure water (high-pressure damages fins)
• Inspect fins for damage and comb out any flattened areas
• Time: 30 minutes per unit

2. Evaporator inspection

• Verify defrost cycle timer is operating correctly
• Inspect drain line for clogs and slope
• Check for ice buildup patterns that indicate gasket or door problems
• Clean drain pan and treat with biocide tablet
• Time: 15 minutes per unit

3. Refrigerant charge verification

• Read suction and discharge pressures
• Calculate superheat at the evaporator outlet
• Calculate subcooling at the condenser outlet
• Compare to manufacturer specs
• Note any charge level outside normal range (5-10% deviation = monitor; >10% = investigate)
• Time: 15 minutes per unit

4. Door gasket inspection

• Close the door on a dollar bill — if it pulls out without resistance, gasket is failed
• Check for visible gaps, cracks, hardened areas
• Quote replacement if condition is poor (don't wait for full failure)
• Time: 5 minutes per door

5. Electrical inspection

• Tighten all contactor and capacitor terminals
• Check contactor points for pitting/arcing
• Verify control board has no error codes logged
• Test door switch operation
• Time: 10 minutes per unit

6. Temperature verification

• Run interior temperature log for 24 hours leading up to visit (some service companies do this remotely with wireless sensors)
• Verify thermostat calibration against independent thermometer
• Time: 5 minutes per unit during visit

7. Documentation

• Service report listing every item inspected, every measurement taken, every part replaced
• Refrigerant log entry if refrigerant was added or recovered (federal requirement)
• Photos of condenser before and after cleaning are a nice-to-have

Fall visit (typically October-November)

Fall service prepares for winter and catches damage that built up during summer's heavy load. Particularly important in northern climates where winter brings its own equipment stresses (frozen drain lines, condenser fan motor freeze damage on rooftop units).

Same checklist as spring, plus:

Additional items for fall:

• Inspect rooftop unit weatherproofing — heat tape on drain lines, fan motor seal integrity, cabinet rust
• Check refrigerant for moisture content via sight glass — sight glass indicator should be green/dry
• Verify defrost heater operation (more important heading into winter)
• For ice machines: deep-clean the water reservoir, descale the evaporator plate, replace water filter

Quarterly checks (operator-handled, no service company needed)

Between professional visits, you should be doing four things on your own equipment. Twice the value if you can train your kitchen staff to do them.

1. Visual condenser coil inspection — every 60 days. Any visible buildup, schedule a coil cleaning.
2. Door gasket dollar-bill test — every 30 days. Takes 10 seconds per door.
3. Temperature log review — daily, or set up automated text alerts (Lascar, MadgeTech, SensorPush all sell sub-$100 wireless loggers).
4. Drain line check — every 30 days. Pour 1 cup of water into the drain pan and confirm it drains within 30 seconds.

Documenting these in a kitchen log (even just a paper sheet on a clipboard) is your first defense if a health inspector asks about temperature compliance.

What a written PM service contract should specify

If you're hiring a service company on a PM contract, the agreement should be written down and specific. Verbal handshake contracts are where most operators get screwed.

The contract should specify:

Frequency and scope

• Number of visits per year (typically 2 to 4)
• Which equipment is covered (list each unit by location and model)
• Hours of coverage for emergency response (24/7 vs business-hours-only)

Response time guarantees

• For emergency calls under the contract (typically 2 to 4 hours for in-contract operators vs 8+ hours for cash-on-call)
• After-hours response definition (some contracts cover 24/7, others only business hours)

What's included vs what's billed separately

• Labor on PM visits: included
• Standard wear parts (gaskets, capacitors, contactors, filters): often included up to a stated value
• Refrigerant: usually billed separately because pricing is volatile
• Major parts (compressors, evaporator coils, condensing units): always billed separately
• Diagnostic visits for non-PM issues: typically billed at a discounted rate for contracted operators (e.g., $95/hr vs $145/hr standard)

Documentation deliverables

• Written service report after each visit
• Refrigerant log (federal compliance requirement under EPA Section 608)
• Annual summary of work performed

Pricing

• Annual contract fee (typical: $400 to $1,500 depending on equipment count)
• Hourly rate for billed work outside the contract scope
• Parts markup policy (industry norm is 20-30% above wholesale)

Cancellation terms

• Notice period for either party to end the contract (typically 30 to 60 days)
• Pro-rated refund policy if you cancel mid-year

Anything not in writing isn't part of the agreement. If a service company won't put their PM scope on paper, find another company.

What's NOT included (and why)

Three things operators sometimes expect from PM contracts that aren't typically covered. Knowing the boundaries prevents disputes.

1. Refrigerant recharges aren't usually free under PM. PM detects whether the system is undercharged. If it is, you'll get a leak-find-and-repair quote separately. The refrigerant itself is volatile in cost — wholesale price changes monthly — so service companies almost always bill it separately.

2. Major component replacements aren't covered. Compressor replacement, evaporator coil replacement, condensing unit replacement — these are capital expenses, not maintenance. PM contracts include the labor to diagnose and quote them, not the parts.

3. Service for equipment NOT listed in the contract. If you add a new prep table six months in and don't update the contract, that prep table isn't covered. Re-paper the contract whenever equipment changes.

The "ice machine PM" exception

Ice machines need more frequent attention than the rest of your refrigeration. The recommended interval is quarterly cleaning (vs twice-yearly for cooler/freezer service) because:

• Water minerals build up scale on the evaporator plate
• Bacterial growth in the water reservoir is a health code issue (FDA Food Code mandates regular cleaning)
• Manufacturer warranties typically require documented quarterly cleaning

A quarterly ice machine cleaning is a 60 to 90 minute job. Most service companies offer it as a separate line item on a PM contract: $125 to $225 per cleaning, or roughly $500 to $900 per year for one machine. For high-volume ice machines (anything over 500 lb/day production), monthly cleaning is sometimes more appropriate.

Brand-specific maintenance notes

Hoshizaki, Manitowoc, and True all publish their own maintenance schedules in the owner's manual. Following the manufacturer's recommendations is the safest bet for keeping warranty coverage valid. Common manufacturer-specific items:

• Hoshizaki ice machines — descale the evaporator plate every 6 months using their proprietary cleaner. Using generic cleaners can void the warranty.
• Manitowoc ice machines — replace the water filter every 6 months (some models have a built-in indicator light)
• True refrigerators — clean the condenser coil every 90 days minimum, more frequently in commercial kitchens with heavy grease load

If your service contract specifies "manufacturer-recommended maintenance" you should expect them to follow these specifics, not generic procedures.

What good PM looks like in practice

A well-run PM visit on a typical restaurant kitchen (two walk-ins, three reach-ins, one ice machine, two prep tables) takes about 3 to 4 hours. A tech who's in and out in 90 minutes is either very efficient (rare) or skipping steps (common). Things to look for:

• Tech has a checklist they're physically working through, not doing it from memory
• Coil cleaning produces visible debris (you should be able to see it in the rinse water)
• Tech checks every door gasket, not just the obvious problem ones
• Tech runs the equipment back up to temperature before leaving and verifies the readings
• Written service report is left on-site (or emailed within 24 hours), not weeks later

Things that should raise flags:

• Tech "doesn't need to clean the coils because they look fine" — they should clean them regardless; visual inspection doesn't catch the thin grease film that does most of the damage
• Tech writes up a service report listing things they didn't actually do (this is unfortunately common with overstretched service companies)
• Tech recommends a major repair on the spot without quoting it in writing
• Tech doesn't ask about issues since the last visit

ROI math for a typical mid-sized restaurant

Two walk-ins, three reach-ins, one ice machine, two prep tables. Annual costs under different scenarios:

Approach	PM cost	Emergency calls	Inventory loss	Equipment replacement	Total
No PM, reactive only	$0	$2,800 (4 calls @ $700)	$1,200 (one $1,200 inventory dump event)	$1,800 (premature equipment replacement amortized)	$5,800
Annual PM	$400	$1,800 (3 calls @ $600)	$400	$1,200	$3,800
Twice-yearly PM	$800	$900 (1.5 calls @ $600)	$0	$800	$2,500
Twice-yearly PM + quarterly ice machine	$1,400	$400 (0.5 calls @ $800)	$0	$500	$2,300

Going from reactive to twice-yearly PM saves about $3,300/yr. Adding quarterly ice-machine attention on top saves another $200/yr.

These numbers will vary by climate, kitchen volume, and equipment age. A new restaurant with 2-year-old equipment will see smaller absolute savings (less equipment to fail). A restaurant with 10+ year old equipment will see larger savings (more failure points to prevent).