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Old 09-27-2008, 04:28 PM   #1
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Need Help with (Lennox 10ACB42-11P)


I have a Lennox 10ACB42-11P outside unit and it just quit working yesterday (fan and compressor do not kick-in).

Upon checking with multimeter, seems like I am not getting 24V at the contactor for some reason. When I manually press and hold the contactor with a insulated screwdriver the compressor and fan kicks in. I have also replaced the dual run capacitor also.

When, I shorted the wire at the thermostat Y & Rc, nothing happens. I am thinking, maybe the 24 volt transformer located in the attic furnace maybe bad. Any ideas what should I do next?

FYI, when I change the thermostat setting to FAN from AUTO, the blower fan also does not come in.


Last edited by a4ncar; 09-27-2008 at 04:42 PM.
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Old 09-27-2008, 06:51 PM   #2
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Need Help with (Lennox 10ACB42-11P)


First thing I'd investigate is whether there is 120V at the furnace, (don't forget the 120V runs through the access door switch). 2nd would be to look for a blown fuse on the computer board in the furnace. If the fuse is blown, the next question is why.

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Old 09-28-2008, 07:49 AM   #3
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Need Help with (Lennox 10ACB42-11P)


Have you had any lawn work done lately? Inspect the low voltage wire going to the condensor for nicks or cuts.
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