Site Services Site Aftersales & Warranty Engineer

Reporting to the Head of Site Services, this role provides urgent warranty and aftersales support for distribution & power transformers across the UK and Europe. This includes responding at short notice to client faults, oil leaks, operational issues and emergency requests, as well as carrying out fault investigation, rectification works and preparing detailed technical reports. The role will also involve some lone working and will require flexibility to support other Site Services tasks when not attending call outs. All applicants must be able to demonstrate their right to work in the UK.

Responsibilities include:

• Responding to warranty and aftersales issues on distribution and power transformers at short notice.
• Carrying out detailed investigation and diagnosis of transformer faults, oil leaks and operational issues.
• Performing rectification works such as gasket replacement, sealing of flanged joints, bushing checks, accessory replacement and mechanical adjustments.
• Completing all paperwork including job sheets, fault reports, RAMS, photographs and service documentation.
• Communicating findings and updates effectively to internal teams, customers and supervisors.
• Travelling frequently across the UK and Europe for site based reactive work.
• Working independently on sites when required in accordance with lone working procedures.
• Supporting wider Site Services tasks including SOP preparation, audits, shop floor work and planned site jobs.
• Assisting with general duties related to distribution and power transformers.
• Carrying out quality checks, health & safety audits and site inspections as required.
• Following all reasonable requests by Management and Supervisors, including duties not specified in this job description.

Warranty & Aftersales Mechanical Tasks:

• Identifying and locating transformer oil leaks.
• Replacing gaskets, seals, O rings and breathers linked to leak rectification.
• Resealing and torque checking all flanged joints to prevent recurrence of leaks.
• Replacing or refitting radiators, conservators and cooling system components.
• Inspecting and refitting bushings (HV and LV) where leak or fault conditions exist.
• Removing, repairing and reinstalling marshalling boxes as part of fault rectification.
• Installing and replacing fans, pumps and cooling system accessories as part of urgent repairs.
• Making mechanical adjustments, bracket repairs and tightening/realigning components following faults.
• Torque checking of mechanical fasteners to specification after repairs or inspections.

Warranty & Aftersales Electrical Tasks:

• Belling out and fault checking wiring within marshalling boxes and terminal blocks.
• Performing electrical isolation, continuity checks and component identification during fault finding.
• Supporting IR (Megger) testing and HV Withstand (VLF) testing during investigations.
• Conducting functional checks on alarms, trips and relays to identify cause of failure.
• Ensuring grounding and bonding of all metallic components following repairs.

Testing Support (As required):

• IR (Insulation Resistance) testing using a Megger.
• HV Withstand test operations.
• Conducting functional testing checks of: Buchholz relay, PRD, MOG, airbag relay, oil surge relay, fans & cooling system controls.
• Gathering testing evidence for use in fault reports.
• Conducting detailed on site fault finding on distribution and power transformers.
• Inspecting physical condition, wiring, accessories and oil system components.
• Capturing photographic evidence, measurements, readings and witness information.
• Completing accurate, timely fault reports documenting findings and recommended actions.
• Contributing to root cause analysis and warranty case documentation.
• Communicating investigation outcomes clearly to internal teams and clients.

Maintenance & Refurbishment:

• Draining and refilling transformer oil as part of leak rectification or repair.
• Replacing gaskets, seals, silica gel breathers and monitoring devices.
• Cleaning, inspecting and preparing internal/external components following faults.
• Replacing or upgrading accessories (e.g., OTI/WTI, relays, pressure devices).
• Collecting oil samples for dissolved gas analysis (DGA).
• Re-torquing and recommissioning transformers after service work.

Site Readiness & Safety:

• Setting up safe work zones and barriers prior to repairs or investigations.
• Using lifting and rigging equipment safely during disassembly or component removal.
• Maintaining a clean, controlled and organised work area.
• Adhering to site‑specific RAMS (Risk Assessments and Method Statements).
• Following lone working rules and dynamic risk assessments where needed.
• Reporting hazards, faults or near misses to supervisors.
• Ensuring safe handling and storage of oil, tools and testing equipment.

Skills, Knowledge & Experience:

• Experience and competence of working on site fitting distribution and power transformers and associated packages is essential.
• Hands on experience of working within a mechanical/electrical engineering environment is essential.
• The ability to understand mechanical and schematic drawings is essential.
• Apprentice trained or a Mechanical/Electrical qualification is essential.
• Experience of Health & Safety and conducting risk assessments is essential.
• Full UK driving licence is essential.
• Transformer full testing experience is desirable.
• Good written and verbal communication skills, with the ability to liaise with customers and resolve issues in a proactive and positive manner.
• Strong troubleshooting skills.
• Excellent attention to detail.
• Flexible and adaptable, prepared to attend site at short notice which may be outside normal working hours.
• Experience of working collaboratively with other operations personnel with the ability to train and enhance your work colleagues’ skills.
• Ideally experience of working within a continuous improvement environment.
• Ideally have up to date training on Overhead Crane/Slinging Lifting certification.
• Ideally have a FLT licence.
• Ideally IPAF certification.

Salary & Benefits:

• Salary negotiable dependent on experience.
• 37.5 hours per week (office based).
• 25 days holiday per year plus 8 bank holidays.
• Employee Assistance Programme.
• EV salary sacrifice scheme.
• On-site parking with EV chargers.
• 3 x salary death in service.