Symptoms of a faulty limit switch on a furnace may include the furnace not turning on or off properly, inconsistent heating, frequent cycling on and off, or the blower running continuously.
When a typical residential furnace or gas package unit "high limit switch" is found to be bad it is replaced with a new one-not repaired.
Bad low limit switch,fan switch.
Bad hi limit switch or filter stopped up
Not likely, could be hi temp limit switch or bad air flow.
what are the symptoms of a bad temperature switch
Bad thermostat, bad high limit switch. Check to make sure that its just not the fan running which makes it look like the furnace is running. If you check, and find the furnace is running and is still firing, shut it down and call a hvac company.
A bad or misadjusted fan limit switch is the first thing I would look for.
Common symptoms of a furnace issue related to a bad flame sensor include the furnace not staying on, frequent cycling on and off, or the furnace not producing heat. Troubleshooting steps for this issue include cleaning the flame sensor with steel wool, checking the sensor's alignment, and ensuring the sensor is securely connected to the furnace.
Symptoms of a bad microwave door switch include the microwave not turning on, the light not turning on when the door is opened, or the microwave running with the door open.
Function that it controls won't work, but fuse and switch are good
A bad safety switch can have one of two symptoms. Either the car will start in any gear, or the car will not start at all.
It is important to know the symptoms of a part going bad. The signs of an ignition switch going bad is it overheating, no clicking when trying to start, the car has issues starting and running.