1. Poor flow of air: One of the most common heater problems is poor flow of air or insufficient heat. If this problem or the filter is not checked or left as it is, then this could lead to damaging of the limit switch.

2. Frequent cycling: Another one of the common heater problems includes frequent cycling. If your heater keeps turning on and then going off repeatedly without really heating your home up then this may indicate a problem. This could be because of a bigger underlying problem and is something that a professional may be able to help you with.

3. Bad thermostat: If you are facing problems with your thermostat and it doesn’t turn or change the heat mode, then it may have gone bad.

4. Grating noise coming from the heater: These days, most of the heater models available are silent and do not make any noise. Thus if you notice a certain sound or a grating noise coming from yours, then this could be an indication of a fault. A loud grinding noise means that some part of the heater has gone loose. This could also mean that the blower wheel is damaged.

5. Constant blowing: One of the common heater problems includes constant blowing. If your heater’s blower runs constantly without shutting off then this could be due to a bad limit switch. You must remember that the blower must never run continuously and should get breaks in between.