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Have started the heating system and it is blowing cold air constantly and will not reset. I cannot turn the heater off

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I am taking it that you are talking about a home furnace.

A home forced air furnace has safety switches in a few spots to prevent fires. When one of these safety switches trip from a problem, it will turn on the blower for the furnace but will not turn on the gas or ignite it for the heat.

The safety switches are pretty small, about the size of a penny. I would first try resetting the switch by pressing the button on it (if equipped with a reset), if there is no reset for it, replace it. Run the furnace, if it does it again...then you have a potential problem with the furnace itself and the switch is saving you from your house catching fire.

An easy way to find the switch is to look around the heat exchanger opening, there is usually one there to monitor flames that do not enter the exchanger. The heat exchanger is the part where the actual flames go into when ignited.

The safety switch will have a wire going to it.

Here is a picture of "a" switch, there are many types.
http://www.appliancedirectparts.com/image/HH11AZ180%20NEW.jpg

You can also Google the term "Furnace Safety Switch" and click no the link for "images" to get an idea of other types to look for.

If you are unsure of what you are doing, it is well worth it to have a licensed tech come out to take a look at it. If you have a cracked heat exchanger (can not see with naked eye unless unit is disassembled), it can let deadly gases get into the airflow and cause a variety of health problems...including death.

Hope this helps you out and good luck with fixing it.

Posted on May 03, 2010

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