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Re: Roof A/C not running - replaced capacitors - what next?

Reply #25 – October 20, 2018, 12:28:25 pm

Is there a fuse on the control board?

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Re: Roof A/C not running - replaced capacitors - what next?

Reply #26 – October 20, 2018, 02:03:41 pm

Well, I guess I fixed it.  It is operating now - fan and compressor.  I did not replace the Control Board.

After I verified that 110vac was going to the board, I pulled all spade connections apart and and reconnected all.  Just for the heck of it  I went to the t-stat and energized the unit again after I turned OFF Zone ! and 2 heat. 

Is it possible that the t-stat can not  operate one zone in Heat Mode and one in Cool Mode?

Anyway, it is operational. 

Thanks to all for providing suggestions as to what I could try to diagnose and "fix" the non-functioning roof ac.

In the next day or two I will hit all of those connections with some dielectric material.

I will check the capacitors that I replaced to verify that they are NFG.  If not I have a couple of spares.

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Re: Roof A/C not running - replaced capacitors - what next?

Reply #27 – October 20, 2018, 02:05:51 pm

I believe they will not do heat and cool at the same time. 

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Re: Roof A/C not running - replaced capacitors - what next?

Reply #28 – October 20, 2018, 02:10:15 pm

If that is the case I might have learned something new. 

My ignorance sometimes overwhelms  me. 

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Re: Roof A/C not running - replaced capacitors - what next?

Reply #29 – October 20, 2018, 02:20:12 pm

I have discovered that mine will not operate with AC in one zone and furnace in one of the other zones as well.

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