My home central heating is blowing cold air?

I have a electric central heating system for some reason it is not blowing hot air. I tested the heating element in the heater its showing there is 240v going to it. I took off the heating element panel so i can see the heating elements. When i unplug the fan the heating elements start to glow red hot but when i... show more I have a electric central heating system for some reason it is not blowing hot air. I tested the heating element in the heater its showing there is 240v going to it. I took off the heating element panel so i can see the heating elements. When i unplug the fan the heating elements start to glow red hot but when i plug the fan back up the heating element cools. I dont know whats wrong with it can anyone help?
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