Arkansas HVACR NewsMagazine January 2024

HVACR NewsMagazine January 2024

Tech News

If the flame rod does not detect a flame in the burner it is monitoring, it will shut the burners shut off after a few seconds. It is also possible for the flame proofing process to fail if there is a bad ground to the package unit, or if the flame rod has carbon buildup on it.

inducer motor, which may cause the pressure switch to trip and open up. When this happens the burners will shut off. To help prevent this issue, ensure that the exhaust vent is properly sealed and intact. Problem #9: The Blower Motor does not Turn On Often, if a blower motor does not turn on, the furnace will overheat and the high temperature limit will open, shutting off the system. Depending on the type of motor used by the blower, there may be a variety of causes. If the blower uses a PSC motor, the motor requires a capacitor to run. In this case, the capacitor should be tested and replaced if necessary. For more on capacitor testing, check out our video on "HVAC Blower Fan Motor CAPACITOR Quick Testing!" ( Note : Even if a capacitor appears to be bad and is replaced, it may still be necessary to replace the blower motor itself, as it may have sustained damage from the faulty capacitor. Further testing may be required to know for sure. )

If there is a build-up of carbon on the flame rod after turning the power off, clean the flame rod with steel wool. ( Note : Remember, any time the package unit has power to it, there is voltage on the flame rod! )

It is also possible for the PSC motor itself to be faulty. If the motor will not operate correctly, but the capacitor is in good condition, the motor may need to be replaced. However, prior to condemning the motor, be sure to properly test the motor to ensure it is the problem. For more on blower motor operation and

When troubleshooting, be sure to check the status code light(s) on the control board for possible errors. Some causes for the burners shutting off after igniting are not as obvious. For example, another potential cause may be if the wind is blowing into the exhaust vent. In this case the wind will push back against the