Diesel Field Service Engineer

WB Power Services; Slough; On-site; GBP 55,000 - 65,000; Full time

Job summary

A leading power services provider in Slough is seeking a Diesel Field Service Engineer to perform maintenance and repairs on generators. The ideal candidate will have a mechanical or electrical engineering background, preferably with generator experience. The role offers competitive hourly rates and a realistic OTE of £55k–£65k, along with excellent training and progression opportunities.

Benefits

Competitive hourly rates

33 days holiday

Private healthcare

Excellent long-term progression opportunities

Qualifications

• Time-served Mechanical/Electrical Engineer or qualified to NVQ Level 3.
• Previous generator experience is advantageous.
• Experience in a mobile engineering role is desirable.

Responsibilities

• Carry out planned and reactive service and maintenance of generators.
• Diagnose faults and complete breakdown repairs.
• Travel to customer sites using a company van.

Skills

Mechanical knowledge

Electrical knowledge

Communication skills

Education

NVQ Level 3 or equivalent

Job description

Diesel Field Service Engineer

WBPS is now Rehlko!

About Rehlko

Rehlko is a global leader in power and energy resilience, with a heritage that spans over 100 years. Formerly known as Kohler/SDMO, Rehlko has continually shaped the way the world powers homes, industries, and critical infrastructure — ever since launching the first modern generator.

As part of this exciting growth, WB Power Services has now become Rehlko. This transition marks our evolution into an OEM, allowing us to design, build, and deliver complete power solutions from the ground up. It’s a transformation that strengthens our technical capability, expands our product range, and deepens the value we offer to our clients.

We retain the strong, values‑led foundation of a family business, while being empowered by the scale, resources, and global vision of Rehlko. For our people, this means new opportunities, bigger projects, and a chance to shape the future of resilient, sustainable energy.

The Role

• Carrying out planned and reactive service and maintenance of generators.
• Diagnosing faults and completing breakdown repairs.
• Using a fully equipped company van to travel to customer sites across your region.
• Working closely with our Coordinators to ensure efficient planning.
• Accurately recording all work using our bespoke management system.
• Participating in the regional on‑call rota (approx. 1 in 6).
• Adhering to company H&S, environmental and quality management systems.

The Person

• Time‑served Mechanical/Electrical Engineer or qualified to NVQ Level 3 (or equivalent).
• Previous generator experience is highly advantageous, though not essential.
• Good knowledge of both mechanical and electrical components (engines/alternators).
• Experience in a mobile engineering role is desirable.
• Able to complete risk assessments and work safely at all times.
• Strong communication skills, confident liaising with customers face‑to‑face and over the phone.
• Comfortable working in a fast‑paced environment.

What We Can Offer You

• Competitive hourly rates (depending on experience).
• Overtime after 40 hours, with realistic OTE of £55k–£65k.
• 10–15% uplift in base pay, depending on your postcode.
• On‑call standby pay.
• 33 days holiday (including bank holidays).
• Company vehicle and fuel card.
• Training and upskilling opportunities.
• Private healthcare.
• Death in service benefit.
• Excellent long‑term progression opportunities.
• Access to our outstanding Employee Assistance Programme.