Flame sensor should read between 5 and 10 micro-amps. If flame sensor shows below it should be replaced. Faulty flame sensor can cause the heating system to shut down unexpectedly. When the flame sensor fails, it sends a signal to the control board to shut off the fuel supply. This is a safety measure to …
by Global HV/AC 
Heating system short cycles On average, your furnace should cycle for about 10 to 15 minutes each time it starts. If your furnace has a bad habit of starting up and then turning off again after a few minutes or even seconds, it is “short cycling.” Here are a few likely culprits for short cycling. …
by Global HV/AC 
Today we serviced Clients in Lincoln Park, Chicago. They just came back from vacations and notice that their furnace was not providing enough heat. Few days before leaving for vacation they experience noise coming from the furnace. They didn’t take the issue seriously thinking there is a loos metal or something in the vents. Noises …
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