Carrier HH19ZA135 Limit Switch Refrigerant What causes these ignitors to

What causes these ignitors to fail prematurely

With a voltage rating of 440 VAC

this specific model is designed for 120V control circuits

the transformer is likely nearing end-of-life and requires replacement to prevent ignition delay

standard pressure switches may fail to close due to lower air density

Carrier HH19ZA135 Limit Switch Refrigerant What causes these ignitors toFor 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