Emerson Alco 048213 Filter Drier or the gas valve failing

or the gas valve failing to pull in even when the board sends a signal

The Conbraco 17-402-01 Relief Valve is a high-capacity hot water pressure relief valve engineered specifically for thermal expansion protection in ASME Section IV heating boilers and water storage systems

making it the industry standard for Emerson and White-Rodgers hydronic controls

the wiring harness is often the culprit due to loose terminal crimps or internal wire breaks

Field testing involves checking for continuity across the terminals at room temperature

Emerson Alco 048213 Filter Drier or the gas valve failingThe Emerson Alco EK 304S liquid line filter drier is a premium 30 cubic inch compressor protection solution designed for high capacity HVACR systems. Engineered with a 1 2" ODF sweat connection and a 20 micron filtration rating, this unit effectively captures solid contaminants while prioritizing moisture and acid removal. Utilizing a buffered desiccant blend of activated alumina and molecular sieve, the EK 304S ensures maximum refrigerant drying