Suburban Mfg 521338 Control Module Board for ST-42 Tankless Water Heater

The Suburban 521338 is a replacement electronic control module board designed specifically for the ST-42 on-demand tankless water heater. This essential component serves as the central processing unit that manages and regulates the heating sequence, ensuring reliable operation of your RV's tankless water heating system.

Key Features:

• Direct replacement control board for Suburban ST-42 42,000 BTU tankless water heaters
• Replaces obsolete part number 233725
• Complete kit includes electronic control board and outer protective case
• Controls ignition timing, temperature regulation, and safety features
• Manages flame-out protection and high-temperature safety shutdown functions
• OEM quality component designed for long-term reliability

This module board is critical for proper operation of the ST-42's on-demand heating system, which provides endless hot water at controlled temperatures. The board coordinates the burner ignition sequence, monitors temperature settings, and activates safety features to prevent overheating or flame-out conditions. Professional installation is recommended for proper calibration and safety compliance.