Laars Heating Systems E0253400 Ignition Module
The Laars E0253400 Ignition Module is a critical field-service replacement part designed for precise combustion control in MightyTherm2 series boilers and volume water heaters. This 24V ignition control manages the startup sequence with a 15-second pre-purge (15sPP) to clear the combustion chamber and a 7-second trial for ignition (7sTFI), ensuring high-reliability flame establishment. This module is engineered to provide stable Direct Spark Ignition (DSI) across various atmospheric and power-vented configurations, specifically fitting Laars MightyTherm2 200, 300, and 400 models (MTH2 200L/N through 400L/N). For technicians troubleshooting lockout issues or flame sensing failures, this OEM Laars heating system part restores factory-spec ignition sequencing and safety timings. Its microprocessor-based logic provides high-tolerance timing accuracy, making the E0253400 a direct, drop-in replacement for failed Fenwal-based controls or legacy ignition boards in compatible Laars equipment.
Key Benefits
- Optimized Startup Timing: Features a 15-second pre-purge to ensure safe gas evacuation and a 7-second trial for ignition for dependable burner light-off.
- Broad Compatibility: Specifically engineered for the Laars MightyTherm2 lineup, supporting models 200, 300, and 400 in both natural gas and liquid propane configurations.
- OEM Reliability: Maintaining exact factory safety parameters, this 24V ignition module ensures system integrity and avoids the nuisance lockouts common with generic alternatives.
- Direct Field Replacement: Standardized mounting and terminal connections allow for fast installation, reducing downtime on critical heating calls.
Common Questions
Which Laars models are compatible with the E0253400?
This module is the standard replacement ignition control for the MightyTherm2 (MT2) series, including the 200, 300, and 400 MBTU units. Always verify the part number on your existing control board, as some high-efficiency units may utilize different 120V or hot surface ignition versions.
Can I use this module to replace a Fenwal 35-60 series control?
Yes, the E0253400 is often a direct replacement for specific Fenwal DSI controls used within Laars equipment. Ensure the pre-purge (15sPP) and TFI (7sTFI) timings match your system’s technical data tag to maintain safe combustion performance.
What does the 15sPP 7sTFI designation mean for troubleshooting?
This indicates the ignition sequence timing: the blower runs for 15 seconds to purge the heat exchanger before the spark electrode energizes, followed by a 7-second window for the flame sensor to detect a pilot or main burner flame before the system enters safety lockout.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Laars E0253400 Ignition Module is a critical field-service replacement part designed for precise combustion control in MightyTherm2 series boilers and volume water heaters. This 24V ignition control manages the startup sequence with a 15-second pre-purge (15sPP) to clear the combustion chamber and a 7-second trial for ignition (7sTFI), ensuring high-reliability flame establishment. This module is engineered to provide stable Direct Spark Ignition (DSI) across various atmospheric and power-vented configurations, specifically fitting Laars MightyTherm2 200, 300, and 400 models (MTH2 200L/N through 400L/N). For technicians troubleshooting lockout issues or flame sensing failures, this OEM Laars heating system part restores factory-spec ignition sequencing and safety timings. Its microprocessor-based logic provides high-tolerance timing accuracy, making the E0253400 a direct, drop-in replacement for failed Fenwal-based controls or legacy ignition boards in compatible Laars equipment.
Key Benefits
- Optimized Startup Timing: Features a 15-second pre-purge to ensure safe gas evacuation and a 7-second trial for ignition for dependable burner light-off.
- Broad Compatibility: Specifically engineered for the Laars MightyTherm2 lineup, supporting models 200, 300, and 400 in both natural gas and liquid propane configurations.
- OEM Reliability: Maintaining exact factory safety parameters, this 24V ignition module ensures system integrity and avoids the nuisance lockouts common with generic alternatives.
- Direct Field Replacement: Standardized mounting and terminal connections allow for fast installation, reducing downtime on critical heating calls.
Common Questions
Which Laars models are compatible with the E0253400?
This module is the standard replacement ignition control for the MightyTherm2 (MT2) series, including the 200, 300, and 400 MBTU units. Always verify the part number on your existing control board, as some high-efficiency units may utilize different 120V or hot surface ignition versions.
Can I use this module to replace a Fenwal 35-60 series control?
Yes, the E0253400 is often a direct replacement for specific Fenwal DSI controls used within Laars equipment. Ensure the pre-purge (15sPP) and TFI (7sTFI) timings match your system’s technical data tag to maintain safe combustion performance.
What does the 15sPP 7sTFI designation mean for troubleshooting?
This indicates the ignition sequence timing: the blower runs for 15 seconds to purge the heat exchanger before the spark electrode energizes, followed by a 7-second window for the flame sensor to detect a pilot or main burner flame before the system enters safety lockout.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
