changing ignition control module


Old 01-25-09, 01:08 PM
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changing ignition control module

Hi, I need to change HS780-34NL-306A ignition control module because the old one does not work any more in my furnace. I just wanted to ask if it is easy to change it myself. Is it as simple as unscrewing the old one, disconnecting the wires attached to it, screwing the new one and attaching back the wires ( of course to the correct places ) ???? or do I have to do anything else, like disconnecting anything else ?? I would really appreciate your help. I changed myself many things at home so I guess I am pretty handy. thank you . jj
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Old 01-25-09, 01:47 PM
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The most important disconnect is to disconnect the 120V from the furnace before you touch anything. Are you certain it is the control module and not just the hot surface ignitor.
Old 01-25-09, 04:52 PM
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Thank you for your answer. Yes, I am sure it is the ignition control module. I will disconnect the electricity from the furnace. Is the rest simply to disconnect the old module and attach the new one with connecting the correct wires??? Is there anything else I should do ??? I was trying to get online some instruction info how to install it but could not find it. I just do not want to do something that will somehow screw up the unit or even make it dangerous. thank you . jj
Old 01-25-09, 06:10 PM
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Manufacturers update ignition modules frequently, so it's entirely possible that wires may need to go to connections labeled differently and there could be switches that need to be set or other adjustments to get the module working properly with your furnace.

Most modules come with a detailed installation manual that covers all these issues and a lot more. You may need to read that carefully in order to install the module properly, and it's designed to be read by a skilled repairman who understands the specialized language that can be used.

If you don't have confidence you can do that kind of job, you are betterb off hiring a competent person to do the work for you.
Old 08-26-09, 08:37 AM
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Originally Posted by emawhite View Post
Hello there. you might want to look at this How to Replace Ignition Control Unit guide. There, jamaja, I hope that one will help you.I learned about that site while I had a problem slightly similarly to yours.
I think his car is a furnace
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