Cofi Ignition transformer TRS818C/42

The Cofi Ignition transformer TRS818C/42 is a component used in burner and boiler systems, identified by type designation 4031.035. It steps up the incoming mains voltage to produce a spark across the ignition electrode gap, and is energized only during the ignition phase under command from the burner control. This transformer is compatible with Master models BV100, BV110, BV160, BV170, BV280, BV290, B230, and B360 air heaters up to 2010.

When selecting a replacement ignition transformer of this kind, confirm that the primary voltage (commonly 230 V, but 110 V and 24 V variants exist), secondary voltage and current rating, duty cycle, mounting arrangement, terminal type, and cable connector pattern match the existing installation. Verify that the physical fixing points and the high-voltage cable connector are compatible with the equipment.

Typical failure modes for this kind of transformer include internal short circuits or open windings, which may result in no spark or weak spark at the ignition electrode. The equipment may fail to ignite or exhibit intermittent ignition. Before concluding the transformer is faulty, inspect the ignition cable for hardening or cracking, as a damaged cable can leak the spark to earth and mimic transformer failure.