Field Service Engineer (m/w/d)

An excellent opportunity for an experienced Field Service Engineer – Mobile Welfare Units to join a well-established company. Job Type: Full-Time, Permanent Salary: Competitive Salary, Depending on Experience. Chelmsford – Home Based – Working in the Field. They are a market leader in the repair and maintenance of towable and static cabins that keep site teams warm, fed and safe on construction, civils and events sites nationwide. To attend, diagnose and repair mobile welfare cabins in the field — restoring generators, power, heating, water and waste systems to full working order, first-time wherever possible, while working safely and unsupervised at customer sites. The role is van-based and mobile, covering breakdowns and warranty/service work across customer and hire-fleet sites. A large share of faults are diagnosed remotely (via unit telemetry) before attending, so the engineer must be comfortable interpreting remote data and arriving prepared. Generators / diesel engines - Oil pressure & oil-change faults, fuel systems, exhaust/DPF, alternator, AVR, governor, glow, E-stop, servicing. Engines: HATZ, Kubota, Lombardini, Perkins, Stephill (Boss L48/L70/L100 units). Plumbing, water & waste - Frozen/burst pipes, tanks, UV filters, water pumps, toilets, waste-level sensors, leaks. Electrical & power - 12/24V DC systems, Victron kit (inverters, Cerbo, MPPT/solar), fuses, relays, wiring looms, sockets, PIR lighting, "no power" / dead-console faults, electrical-test compliance. Diesel heaters - Parking/diesel heaters — glow-pin and fuel-pump failure, re-priming, rewiring, thermostats, frost-related no-heat. Telemetry / comms - Units not updating/communicating — SIM/modem, Cerbo, remote-monitoring diagnosis and SIM replacement. Towing & chassis - Lifting rams/pins, wheels-down locking, coupling, brakes, tyres — getting units mobile. Hydraulics - Power packs, rams, solenoids for raising/lowering units. Fabrication - Doors, door closers, hoods, structural repair. Proven multi-skilled field service / plant / mobile-mechanic background (welfare units, generators, plant, HGV, marine, motorhome/leisure, or similar). Diesel engine fault-finding and servicing (small industrial engines — HATZ, Kubota, Lombardini, Perkins or equivalent). 12V / 24V DC electrical competence — fault-finding wiring, fuses, relays, inverters, charging systems using a multimeter. Confident reading fault data / telemetry and working from remote diagnostics. Practical plumbing / water-system repair skills. comfortable working alone and unsupervised. Full UK driving licence; Electrical qualification — City & Guilds 2391 (Inspection & Testing) and/or 18th Edition (BS 7671); PAT competence. Experience with Victron energy systems (Cerbo GX, MultiPlus inverters, MPPT, VRM) and lithium/BMS battery systems. Fabrication repairs. Relevant safety tickets (CSCS Card, first aid, working at height, manual handling). Self-motivated and reliable — the customer's day-rate is stopped until the unit works again. Resilient and adaptable — outdoor, all-weather, sometimes remote sites. Field-based, mobile role with company van and tools. Regional travel to customer and hire sites; Physical role: lifting, working outdoors, in confined welfare-unit plant spaces and all weathers. Competitive salary (depending on experience). Company pension. Company van, tools and PPE. Manufacturer and in-house training across generators, power, heating and telemetry. If you feel that you have the relative skills/attributes to fulfil this role then please apply now for immediate consideration. The employer fully supports Equality in Employment.