From reactive chaos to planned calm: building a PPM schedule across HVAC, gas, refrigeration and FM

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Winter piles pressure on estates. Breakdowns spike, costs creep, and compliance windows close fast. A single planned preventive maintenance (PPM) schedule can turn scattered jobs into predictable tasks, cut disruption, and keep every site safe and trading.

This guide shows how to build a 12-month UK calendar across HVAC and AHU, boilers and gas plant, refrigeration, TR19, water hygiene, and building fabric. It includes asset criticality scoring, statutory versus best-practice intervals, bundling tactics to reduce cost, the core KPIs to track, and the documentation you should hold. It also explains how First in Service delivers integrated hard and soft FM with 24/7 reactive backup.

What planned preventive maintenance planning looks like

Preventive maintenance planning defines what to service, when, by whom, and to what standard, then documents the result. It rolls statutory inspections and best-practice tasks into one coordinated plan so you reduce risk, extend asset life, and keep compliance evidence audit-ready.

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The four types of maintenance typically used are:

• Corrective (run to failure, then fix)
• Preventive (time or usage based)
• Predictive/condition-based (triggered by measured condition)
• Proactive (root-cause actions that prevent recurrence)

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Facilities maintenance spans hard FM (plant, HVAC, refrigeration, gas, electrical, water hygiene, fabric) and soft FM (cleaning, waste, grounds, consumables, helpdesk). A unified schedule aligns both, so technicians arrive once, complete multiple tasks, and leave clean records.

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Scoring asset criticality and setting intervals

Start with an asset register. Score each asset 1 to 5 for:

• Safety and compliance impact
• Operational impact on trading or care
• Failure likelihood and repair lead time
• Replacement cost and parts availability

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High-scoring assets get tighter intervals and resilience plans (spares, secondary units, remote alarms). Map tasks by statutory requirement first, then layer best practice:

• Gas plant: annual commercial gas safety inspection and CP42 where applicable, with calibrated gas tightness testing and flue checks. High-use or critical sites often add a mid-year service.
• Refrigeration and AC: F-Gas leak checks per UK thresholds and records; biannual servicing for offices and retail; quarterly in high-dust or 24/7 sites.
• AHUs and ventilation: quarterly as a UK baseline, with monthly filter checks in heavy-use areas; hygiene cleaning to risk.
• TR19 kitchen extract: frequency by cooking volume and grease measurements, typically quarterly to annual, documented with micron readings and photos.
• Water hygiene: Legionella controls per risk assessment, including routine temperature checks, flushing, sampling, and tank cleaning or disinfection where indicated.
• Building fabric: seasonal inspections for roofs, gutters, doors, windows, fire stopping and finishes; remedials scheduled to avoid weather risk.

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A sample 12-month UK PPM calendar

Use this as a starting point and tune to your risk profile and site count.

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• January to February: annual gas safety checks and commercial boiler servicing; winter AHU inspections focusing on heating coils and frost protection; water temperature checks and flushing routines; gutter and roof inspections after storms.
• March: spring AHU deep clean of cooling coils and condensate sections; replace or upgrade filters; pre-summer HVAC checks; F-Gas record review.
• April: TR19 inspection and clean ahead of summer covers for kitchens; refrigeration service visit before ambient temperatures rise; cold room door seals and controls check.
• May: AC performance verification, condensate clearing, belts and pulleys, electrical checks; water hygiene sampling where risk indicates; BMS schedule review.
• June: refrigeration service follow-up and leak checks; AHU filter inspection; review spares for critical cooling.
• July: mid-year compliance review, close actions; building fabric inspections; pest and drainage checks in high-traffic sites.
• August: schools and education deep window for combined FM works, including kitchen equipment servicing, ventilation cleaning, fabric repairs; confirm Legionella records after occupancy changes.
• September: heating readiness checks, boilers pre-ignite tests, gas interlock verification; AHU belts retension; roof and gutter cleans pre-autumn leaf fall.
• October: TR19 visit before peak cooking periods; confirm grease measurements and issue reports; water hygiene check on calorifiers and tanks ahead of colder weather.
• November: second HVAC and AHU service for the year; filter replacement; verify frost stats and setpoints; energy optimisation checks.
• December: compliance pack tidy-up, certificate renewals planned for Q1; spare parts top-up; helpdesk and 24/7 escalation test.

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Bundle multi-trade visits. For example, align TR19 cleaning with ventilation maintenance and kitchen gas checks in one access window. Pair boiler servicing, gas safety inspections, and water hygiene checks on the same day where plant room access overlaps. Combine AHU service with AC coil cleaning and F-Gas record verification.

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The PPM checklist you actually use

A practical PPM checklist should capture:

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• Asset ID, location, criticality score, last service date
• Statutory tasks due this visit (gas safety, F-Gas, TR19, Legionella)
• Best-practice tasks (filters, coils, belts, drains, controls, seals)
• Readings and results (pressures, temperatures, combustion, leak tests)
• Failures found and remedials raised with priority codes
• Photos, signatures, date and time stamps, and parts used
• Document attachments and next due date

Standardising this across sites makes portfolio reporting cleaner and speeds audits.

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KPIs that keep you honest

Track a short set of metrics:

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• Downtime hours per site and per asset class
• First-time fix rate and mean time to repair
• PPM completion rate on or before due date
• Statutory compliance rate with zero overdue certificates
• Repeat fault rate within 90 days
• Energy intensity for HVAC where metered or trended

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Compliance documents to keep

Maintain an accessible compliance pack per site:

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• F-Gas logs and leak checks, refrigerant additions and recovery records
• Gas safety certificate or commercial gas safety certificate (including CP42 where relevant), tightness test results, combustion analysis
• TR19 reports with micron readings and photographic evidence
• Legionella risk assessment, temperature logs, flushing records, sampling and lab results, tank cleaning or disinfection certificates
• AHU and HVAC service reports, filter changes, coil cleans, performance checks
• Refrigeration service and repair logs
• Building fabric inspection reports and remedial records

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Integrated FM with reactive backup

Planned work prevents most failures, but not all. First in Service delivers integrated hard and soft FM, scheduling PPMs across HVAC, refrigeration, ventilation, gas and plumbing, water hygiene, cleaning and fabric, then backing it with 24/7 engineers for urgent issues. See how we approach planned preventative maintenance in our preventive plan guide. For urgent cover, our rapid response maintenance team supports nationwide estates.

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Where gas, plumbing or boilers are in scope, using a competent commercial gas engineer keeps inspections, gas tightness testing and commercial boiler servicing aligned in one visit. Kitchens benefit when TR19 work is coordinated with ventilation cleaning and catering equipment checks. Water hygiene can be scheduled alongside routine legionella risk assessment follow-ups and sampling.

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• Explore planned preventative maintenance planning at First in Service: https://firstinservice.co.uk/blogs/how-to-create-a-preventive-maintenance-plan-for-your-facility
• Get rapid response maintenance support: https://firstinservice.co.uk/
• Learn about ventilation cleaning and kitchen extract cleaning services: https://firstinservice.co.uk/mechanical-ventilation-extraction
• Read more about legionella prevention and testing: https://firstinservice.co.uk/blogs/why-regular-legionella-testing-is-crucial-for-your-business

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FAQ's

What are the four types of maintenance?

Corrective, preventive, predictive or condition-based, and proactive.

What is preventive maintenance planning?

A structured process to define tasks, intervals and responsibilities so assets are serviced before failure and compliance is evidenced.

What is a PPM checklist?

A standard form listing the assets, statutory tasks, best-practice checks, measurements, findings, photos, remedials and next due dates.

How do I create a preventive maintenance plan?

Build an asset register, score criticality, set statutory and best-practice intervals, bundle visits by trade and access, schedule a 12-month calendar, capture results in standard reports, and review KPIs quarterly.

What counts as facilities maintenance?

Hard FM such as HVAC, refrigeration, gas, electrical, water hygiene and fabric, plus soft FM such as cleaning, waste, grounds and consumables.

Which documents should I keep for compliance?

F-Gas logs, gas safety certificates, TR19 reports, Legionella risk assessment and water hygiene records, plus service reports for HVAC, AHU and refrigeration.

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Summary and next step

A single PPM schedule shifts estates from firefighting to predictable, compliant operation. Score critical assets, fix your intervals, bundle visits, track a few sharp KPIs, and keep your documents tight. If you want a unified plan with 24/7 cover and one helpdesk, First in Service can coordinate hard and soft FM across every site while your team focuses on running the estate. Contact us to align your winter-ready calendar and cut unplanned downtime.

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