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Furnace blowing 5 amp fuses

\015 I have a heil furnace (H9MPD100J20C1)that has worked fine for almost three years; now will not heat. I met with a tech yesterday and replaced the fuse on the control panel - worked fine for a short while and then blew the fuse again. I assume there is a short in the system - any ideas on the best way to find it?\015

Answers :

This is caused by a low voltage short. Most often it's the T-stat wires going to the condenser unit outside. Check to see if the insulation on the wires have degraded and replace them if necessary. Also, if the wire has been spliced before redue the joint and weather seal it so that it won't happen again. This is what I do for a living so if you have any more questions, please feel free to ask more questions.

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