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ejj1862 · Nov 17, 2009, 07:41 PM

I'm working on this Goodman Model # aw18-05c and the blower comes on and the condensing unit comes on but the heating element won't activate, do you have any suggestions; I think the sequencer is defective but I don't know for sure.

letmetellu · Nov 17, 2009, 08:42 PM

Since an electric heater is different from a gas heater you can't see if it is burning so you will need an ohm meter and a volt meter. You can use this to telol you if electricity is getting to the element. Elements have a tendency to burn into and the only way to find out is with the proper meters.

I would almost bet it is the element, if you wanted to you could take the element out and trace the element to see if it has parted somewhere. Just remember to mark all of the wires and shere they go,

KC13 · Nov 17, 2009, 08:48 PM

Troubleshooting an auxiliary heater with power applied requires great care to avoid personal injury, or worse, personal extinction. Normally, the sequencer heat motor (coil) is powered by 24 volts, and a delayed switching action (both ON and OFF) is produced. If sequencer is powered but no current is measured, check for 240 volts (or thereabout) across the sequencer switch(es). If present, switch(es) aren't closing, indicating a faulty sequencer. If 0 volts are measured at this point, the problem lies elsewhere - fusible link, limit control, heater string, wiring, or power supply.

hvac1000 · Nov 18, 2009, 02:03 AM

As mentioned before becareful when testing.

ejj1862 · Nov 18, 2009, 03:44 PM

So if while sequencer is powered with 24 volts and I get a readingbetween m1/m2 it is likely that I have a faulty sequencer; is this a safe assumption

ejj1862 · Nov 18, 2009, 03:48 PM

So if while voltage is applied to sequencer and I get a reading across m1/m2 it would be a realtively safe assumption in saying that the sequencer was faulty

KC13 · Nov 18, 2009, 03:54 PM

If you measured 24 volts at the control input terminals (after approximately 2 minutes) and line voltage across "M1" & "M2", the sequencer is faulty. The presence of voltage at this location also verifies that the complete heater circuit is intact. Good job. ;)

hvac1000 · Nov 18, 2009, 04:15 PM

I thought the picture would help. This is where I always like to use a amprobe but you probably do not have one handy.