The Carrier HK42FZ018 Control Board is a critical integrated furnace control board engineered for high-performance management of single-stage heating systems

The unit features tri-class protection (Class 5

while highly effective with CFC/HCFC refrigerants like R-22

offering identical electrical ratings and mounting footprints

EPDM gaskets

Heat Controller R68GF0004 Flame Sensor 320788-702 The Carrier HK42FZ018 Control BoardThe Heat Controller R68GF0004 Flame Sensor is a critical OEM safety component engineered for precise flame rectification in Mortex G18D series gas furnaces. As a veteran technician knows, a fouled or oxidized sensor is the primary culprit behind modern furnace short cycling. This furnace flame sensor replacement features a high grade stainless steel rod designed to withstand extreme combustion temperatures while maintaining the sensitive microamp