Can I use an aftermarket relay instead

OEM Compatibility: Specifically calibrated for Bard wall-mount units

5" WC threshold is reached

Common Questions Is the Robertshaw 1830-704 compatible with electronic ignition systems

or the furnace seizing during the initial startup sequence

Allanson 421-655-G Transformer 30067439-890 Can I use an aftermarketThe Allanson 421 655 G Transformer is a high performance ignition transformer engineered specifically for Power Flame burners and high demand commercial heating systems. This heavy duty unit operates on a 120Vac supply voltage, delivering a consistent 10,000Vac secondary voltage at 23mA to ensure reliable arc stabilization and efficient fuel ignition. Designed with a midpoint ground configuration, the 421 655 G minimizes electromagnetic interference