The Field Service Engineer will attend customer sites across the region to diagnose and repair mobile welfare units, restoring generators, power, heating, water, and waste systems to full working order. This full-time, permanent position is home-based in Chelmsford, with work conducted in the field from a company van. The role involves covering breakdowns and warranty service work, operating safely and unsupervised to achieve first-time fixes wherever possible. Applicants should possess strong fault-finding skills and experience with towable or static cabins. A competitive salary is offered, dependent on experience, alongside the autonomy of a mobile role within a market-leading national business. 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. Location: Chelmsford – Home Based – Working in the Field.
About The Company
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.
About The Role
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.
What the Role Actually Deals With
- 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.
- Batteries - Lithium battery diagnosis (100/200Ah), BMS behaviour, Victron charge settings, deep-discharge recovery, charge/hold faults. <
Field Service Engineer in Chelmsford employer: JAM Recruitment Ltd
At JAM Recruitment Ltd, we pride ourselves on being an exceptional employer that values the growth and development of our team members. Located in Birmingham, we offer a dynamic work culture that fosters collaboration and innovation, alongside competitive salaries and hybrid working options. With a strong focus on career progression, our employees are empowered to take on leadership roles and make a meaningful impact in the field of personal injury law.
