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45 years of trusted expertiseIgnition Units, Transformers & Leads
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Browse genuine replacement ignition units, transformers, and spark leads designed for compatibility with leading UK boiler brands. These essential electrical spares ensure reliable spark generation and safe sequence control for swift lockout repairs.
Showing 1—30 items of 110
A failing ignition system is a primary cause of boiler lockouts, making rapid access to reliable replacement parts critical for heating engineers. Our extensive stock includes high-voltage spark generators, ignition transformers, burner leads, and complete ignition control units engineered to precise manufacturer specifications. Supplying OEM and approved compatible components for major brands guarantees correct voltage output and safe appliance operation. Replacing degraded ignition leads or burnt-out transformers with genuine spares ensures optimal combustion and prevents repeat callouts. Carrying common ignition components on the van allows installers to resolve intermittent firing issues quickly on the first visit. For technical guidance on diagnosing faults and fitting these spares, see our frequently asked questions below.
Frequently Asked Questions
How do I test a boiler ignition transformer?
Testing an ignition transformer involves using a multimeter to check the resistance across the primary and secondary coils. You must isolate the electrical supply to the boiler before testing and consult the manufacturer's technical manual for the exact resistance values expected for that specific model. If the readings fall outside the specified range, or if the unit receives the correct voltage from the printed circuit board but fails to output a high-voltage spark, the transformer requires replacement.
Can I replace just the ignition lead, or do I need a full unit?
If the ignition lead shows visible signs of physical wear, such as cracked insulation or carbon tracking, it is often sufficient to replace just the lead and the connected electrode. However, if the lead and electrode test fine but there is no spark generation, the fault is likely within the ignition transformer or the main control board. A systematic diagnostic approach is essential to determine whether a simple lead swap will resolve the issue or if a complete ignition unit replacement is necessary.
Are ignition leads and transformers universal?
Ignition components are highly specific to the boiler make and model, meaning universal parts are not suitable or safe for internal appliance repairs. Each transformer is engineered to deliver a precise voltage and features specific terminal connections and mounting brackets designed to fit securely within the appliance casing. Always use the Gas Council number of the boiler to identify and install the correct manufacturer-approved replacement part to guarantee safe combustion and maintain warranty conditions.