How do I troubleshoot a 1-flash LED code on this board

While the sensor has 1/4" nipples for 3/8" OD tubing

reducing the need for multiple specialized modules

Reliable Plunger Mechanism: Built to withstand the high-temperature environment of a furnace cabinet without binding or mechanical failure

Ranco pressure and temperature controls can be mounted vertically or horizontally without affecting the calibration or internal switch mechanism

Carrier 48SS660005 Heat Exchanger 326058-758 How do I troubleshoot aThe Carrier 48SS660005 Heat Exchanger is a critical combustion component engineered for high efficiency thermal transfer in Carrier rooftop units and packaged gas heating systems. Constructed from aluminized steel to resist oxidation and thermal fatigue, this replacement heat exchanger maintains the structural integrity of the furnace section during high fire cycles. Field technicians recognize this part as a direct OEM replacement designed to restore