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What is the brand and model number of your furnace?
Ok, I don't have access to Armstrong specs. I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.
Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Please be patient as many times we work with several customers at once.
Did you still need help with this? Do you have access to a voltmeter and know how to use?
If the burners are not even coming on at all, it would not be the flame sensor.
You say the hot surface ignitor comes on, correct?
Your furnace has a hot surface ignitor, correct? An element that glows bright orange and lights the burners?
Just post back here whenever he is available to chat.
If there is no bright orange glow, it could be that your HSI (hot surface ignitor) is burned out (very common). This would also explain the click you're hearing and no burners lighting.
Can you take a clear picture of the wiring diagram on the unit and upload here?
Yes, so this tells me you have spark ignition. And you are getting no spark? Does the inducer motor (small motor at the top of furnace) start on a call for heat?
Get your self a voltmeter, set to "volts AC" and put one probe on 24v (GND) and the other on 24 V on ignition module. Turn on heat and shortly after inducer motor start, we should see 24 volts AC. Let me know what you find.
Yes, that will be fine.