Gas Valve Failure

We occasionally see a failed gas valve as the cause of a furnace or roof top unit (for commercial applications) not operating. The photo above is of a two stage gas valve in a residential furnace. The natural gas line runs from the natural gas meter outside of the...

Low Voltage Transformer Failure

Diagnosing the failure of a low voltage transformer in a furnace or commercial building roof top unit It is very unusual for a low voltage transformer in a residential furnace to fail and when they do fail, it is normally a symptom of some other component failing. The...