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Old 07-31-2014, 03:17 PM   #16
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Goodman 18 SEER heat pump problems


Ok, I found the wiring diagram. I personally have not seen this unit before. I see what your talking about now. The unit doesn't have a traditional contactor, the power supply is wired strait to the board. I didn't see a transformer on the diagram....?

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Old 07-31-2014, 04:17 PM   #17
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Goodman 18 SEER heat pump problems


Rheem apparently is using some kinda of "optical" relay instead of a contactor. Have not seen it but apparently they use it as it is sealed from bugs getting in and does not arc and burn the points. I suspect Goodman and others may try it.

Hate to say it but Lennox and all the brands are getting VERY VERY high tech and unless you are trained by them you will not understand their newest methods etc. NO way in the world any non Lennox tech will figure out a Lennox mod furnace.

As a DIYer you are on your own w/o that knowledge. Pretty soon you will be getting a brand specific tech to do the repairs. It may have a very specific startup sequence and something got damaged if you did not follow it. The board needs to burn in some settings.

Hopefully you used the exact type and gauge of thermostat wire they want as there have been problems with signal interference with some earlier Lennox units and the unused wires needing grounding etc. Everything including the wiring and methods is getting very specific and can damage a board if not done exactly to their details.

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Last edited by yuri; 07-31-2014 at 04:24 PM.
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Old 07-31-2014, 10:12 PM   #18
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Goodman 18 SEER heat pump problems


Quote:
Originally Posted by yuri View Post
Rheem apparently is using some kinda of "optical" relay instead of a contactor. Have not seen it but apparently they use it as it is sealed from bugs getting in and does not arc and burn the points. I suspect Goodman and others may try it....
Sounds like a solid state relay (SSR).

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