Laars Heating Systems RE2105500 Diagnostic Board for Pennant Boilers

The Laars Heating Systems RE2105500 is a replacement diagnostic board designed for Pennant series commercial boilers. This critical control component serves as the central diagnostic interface for the boiler's control module, providing essential system monitoring and troubleshooting capabilities.

Key Features:

• Integrated diagnostic panel with test points and diagnostic indicator lights
• 24-volt ignition module with 3-try, 4-second timing for safe ignition sequences
• Located on the right side of the control module, behind the display panel
• Serves as the termination point for multiple wiring harnesses (P1 through P10)
• Compatible with Pennant 500-2000 series boilers and water heaters
• Replaces obsolete part number E2105500

This diagnostic board is an essential replacement part for HVAC professionals servicing Laars Pennant copper tube boilers and water heaters. The integrated test points and diagnostic lights enable rapid troubleshooting of ignition systems, control sequences, and operational faults. Proper installation requires verifying correct wiring harness connections to ensure reliable boiler operation and safety system functionality.