If all connections are good and components are clean, what is often the cause of low flame sensor current?

The cause of low flame sensor current, given that all connections are intact and components are clean, is commonly associated with a defective ignition module. The ignition module is responsible for regulating the flame sensing signal and ensuring that the flame sensor can detect the presence of the flame correctly. If the module is malfunctioning, it may not provide the necessary voltage or current to the flame sensor, leading to low sensor current readings.

When the ignition module fails, it may not activate the flame sensor properly or might interfere with the signal being sent back to the control system, which alters the expected behavior of the system in terms of recognizing or maintaining a stable flame. This situation can lead to safety issues if the system is unable to ensure that a flame is present.

Understanding this relationship helps technicians troubleshoot effectively, as they can identify the ignition module as a critical component in maintaining proper flame sensor current. Adjustments or replacements of the ignition module may be necessary to resolve the issue of low flame sensor current.