Cofi Ignition transformer TRS820PIS03

The Cofi TRS820PIS03 is a step-up ignition transformer designed for use in low-power diesel and heavy oil burners. It operates from a 230 V, 50 Hz supply and is energized only during the ignition phase. The transformer features a compact housing and silicone-insulated ignition cable, and is manufactured in Italy.

When selecting a replacement ignition transformer of this type, verify that the primary voltage matches the burner control output (typically 230 V, but 110 V and 24 V variants exist). The secondary output must be compatible with the electrode gap and control box specifications. Also ensure the physical footprint and fixing centres align with the mounting bracket on the burner. Inspect the high-tension cable and electrode condition before condemning the transformer.

Common failure modes include cracked or hardened ignition cables, which can cause the spark to leak to earth, potentially mistaken for a faulty transformer. Other issues may involve internal short circuits or open windings, leading to no spark or weak spark at the electrode. Check the high-tension cable and electrode condition first, and verify the primary voltage is present during the ignition phase.