A faulty switch typically triggers a specific diagnostic flash code on the furnace control board

OEM-spec electromagnetic switch engineered for 120V heating systems

What control signal does this actuator require

With a max RPM of 4

Laars Heating Systems RE0240900 Pressure Switch 320734-701 A faulty switch typically triggersThe Laars Heating Systems RE0240900 Pressure Switch is an essential OEM component specifically engineered for precise HVAC pressure monitoring in Pennant Pool Heaters and high efficiency hydronic systems. This SPDT pressure switch features a critical . 75" WC (Water Column) set point, ensuring the unit only fires when the blower or exhaust system achieves the necessary static pressure for safe combustion. Built with a Single Pole Double Throw