The blink code identifies specific faults such as pressure switch stuck open

check for refrigerant overcharge

field wiring must be terminated at the 0

making it compatible with shell-band mount configurations

maintaining optimal superheat for peak system efficiency

Carrier HH19ZA135 Limit Switch 318518-761 The blink code identifies specificFor contractors servicing Carrier residential and light commercial equipment, the Carrier HH19ZA135 Limit Switch is a critical safety component designed for precise thermal monitoring. This fixed temperature furnace limit control features an L135 40F calibration, meaning the contacts are normally closed and will open on a temperature rise at 135F, automatically resetting once the temperature drops below the 40F differential. This genuine OEM Carrier