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Thanks ozone and hvactechfw for the help. Feels good to fix it myself and learn something along the way.

OK, finally got it. Connecting the transformer directly to the contactor I found the contactor would activate correctly. At this point I suspected your suggestion about the wiring was correct. Fortunately the next step I took was to connect the transformer directly to the contactor using the...

Equipment: Gas Heat unit: Lennox G12 Series Outside compressor Armstrong Concept 10 Experience: Novice at HAVC. Some electrical experience (house wiring and digital electronics) Problem: Outside unit stopped working (both compressor and fan). Blower motor works ok...