Field Service Engineer

JAM Recruitment Ltd; Chelmsford; On-site; GBP 36,000 - 48,000; Full time

Job summary

JAM Recruitment Ltd in the United Kingdom is seeking an experienced Field Service Engineer to work on mobile welfare cabins. The role is home-based in Chelmsford and involves field work from a company van across the region.

You will diagnose and repair generators, heating, water and waste systems, aiming for first-time fixes, with remote telemetry data guiding visits. This is a full-time, permanent position with a competitive salary depending on experience.

Qualifications

• Strong fault-finding skills.
• Experience with towable or static cabins.

Responsibilities

• Attend customer sites to diagnose and repair mobile welfare cabins.
• Restore generators, power, heating, water and waste systems to full working order.
• Work van-based, field duties across the region; aim for first-time fixes.
• Handle breakdowns and warranty service work safely and unsupervised.
• Interpret telemetry data remotely to plan on-site attendance.

Skills

Fault finding

Towable/static cabins

Job description

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.
<