Essential Pre Season Maintenance for Campervans and Motorhomes

Pre-Season Essentials: TL;DR

• Timing: April is the critical window for 'shakedown' maintenance before the summer peak.
• Battery Health: Leisure batteries often suffer from 'sulphation' if left uncharged; check for a rested voltage of 12.7V.
• Hygiene: Sterilise water systems to remove biofilm and potential Legionella using food-grade cleaners.
• Gas Safety: Replace high-pressure hoses (pigtails) every 5 years; check regulators for blockage.
• Tyre Care: Inspect for sidewall cracking and flat spots; check pressures whilst tyres are cold.

With the spring flowers blooming and temperatures finally climbing in April 2026, the urge to simply 'turn the key and go' is strong. However, a motorhome or campervan that has sat idle since October is a vehicle that has been under environmental stress. Spending a single Saturday on a systematic pre-season audit will save you from the frustration of a failed water pump or a flat leisure battery on your first night away.

RoamWorthy follows an editorial policy that prioritises practical, safety-first maintenance over temporary fixes.

The 12V Electrical Audit

The leisure battery is the heart of your living space. If it wasn't kept on a trickle charger over winter, it may have dropped below the critical 12.2V threshold, leading to permanent capacity loss. This is particularly common in older Volkswagen Transporter conversions or Swift Lifestyle models if the control panel has a high parasitic draw.

• Voltage Check: Use a multimeter or your onboard control panel. A healthy, fully charged rested battery should read 12.7V to 12.8V.
• The Load Test: Turn on all your LED lights and the water pump. If the voltage plunges instantly below 12V, the battery is likely reaching the end of its life.
• Clean the Terminals: Remove any white powdery corrosion with a wire brush and apply a thin layer of petroleum jelly to prevent further oxidisation.

Water System Hygiene & Frost Damage

Stagnation in your tanks and pipes over winter creates a 'biofilm'—a slimy layer where bacteria thrive. Simple flushing with fresh water is not enough to ensure your system is safe for the 2026 season.

• Sterilisation: Use a dedicated, food-grade tank cleaner like Puriclean. Fill the tank, run it through all taps (including the shower), and leave it for the time specified on the bottle.
• The Leak Test: Once the system is filled and pressurised, turn off the taps and listen. If your water pump 'cycles' (turns on for a second) every few minutes, you have a pressure leak, likely caused by a frost-cracked plastic fitting or a damaged Truma or Alde boiler valve.
• Filter Replacement: If your van has an inline water filter (common in Auto-Trail Imala and Bailey Autograph 74 4 models), replace it now to ensure better taste and flow.

The Road-Ready Safety Check

Before you hit the motorway, you must verify the 'heavy' components that affect your safety and legality. Overloading is a common issue when packing extra spring gear—you can use our Motorhome Weight Checker to stay within your Maximum Authorised Mass (MAM).

Professional Support

If your pre-season checks reveal that your van needs professional intervention, our dealer network includes many AWS-accredited workshops that specialise in spring habitation checks. If you find your current van is no longer fit for your 2026 plans, perhaps needing more payload or a different layout, you can browse campervan models or view used campervan deals. If you are considering a new build, use our Campervan Conversion Checker to ensure it meets safety standards.

Frequently Asked Questions

For a more detailed look at the electrical systems, check out our guide on campervan systems that fail first after winter.