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Old 07-31-2014, 04:17 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, 05:17 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 05:24 PM.
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Old 07-31-2014, 11:12 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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Old 11-25-2014, 11:21 AM   #19
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Goodman 18 SEER heat pump problems


Hi fljoslin !
how do you fixed your system ? Local HVAC guy( not a goodman technician ) yesterday installed the dszc18 3T unit in my house , but he was not able to make it run . wehen he applied the power to the heat pump , the heat pump started to running in heat mode for 30 -45 second and shut down itself , the fan never turned on . he was on the phone with the goodman technician for a few minutes , during this time the unit flipped the breaker down. After this the L1 power connection on the control board become grounded . he was not able to start the system anymore .
The airhandle working fine with the 8kw heat strip , and communicating with the thermostat .
My Setup Is :
CTK004 Thermostat
DSZC18 3T Heat pump
AVPTC42D14A Air Handler
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Old 11-25-2014, 11:29 AM   #20
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Goodman 18 SEER heat pump problems


this is the control board what my unit also have : youtube.com/watch?v=UV-XxAe3pjY
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Old 11-25-2014, 12:47 PM   #21
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Goodman 18 SEER heat pump problems


Quote:
Originally Posted by Joshi View Post
Hi fljoslin !
how do you fixed your system ? Local HVAC guy( not a goodman technician ) yesterday installed the dszc18 3T unit in my house , but he was not able to make it run . wehen he applied the power to the heat pump , the heat pump started to running in heat mode for 30 -45 second and shut down itself , the fan never turned on . he was on the phone with the goodman technician for a few minutes , during this time the unit flipped the breaker down. After this the L1 power connection on the control board become grounded . he was not able to start the system anymore .
The airhandle working fine with the 8kw heat strip , and communicating with the thermostat .
My Setup Is :
CTK004 Thermostat
DSZC18 3T Heat pump
AVPTC42D14A Air Handler
The problem seemed to be how the power wiring was run in the compressor unit. There is an inductive field measuring device which measures if the outside unit is drawing current. That is how it tells if it is running or not. The power wire has to go through that device. It is similar to how an ammeter works. As soon as I routed the power through this "ring" everything was on the way to working.

Good luck.
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Old 11-25-2014, 12:49 PM   #22
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Goodman 18 SEER heat pump problems


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Originally Posted by fljoslin View Post
The problem seemed to be how the power wiring was run in the compressor unit. There is an inductive field measuring device which measures if the outside unit is drawing current. That is how it tells if it is running or not. The power wire has to go through that device. It is similar to how an ammeter works. As soon as I routed the power through this "ring" everything was on the way to working.

Good luck.
To qualify, the power wire has to physically pass through the inside of the ring. Just like a non contact ammeter.

As a true DIYr I figured this out all by my self.
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Old 11-25-2014, 01:02 PM   #23
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Goodman 18 SEER heat pump problems


so after you routed the (red?) power wire to the compressor through in that " ring" everything started working ? No more compressor start after power connected to the heat pump ?
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Old 11-25-2014, 01:16 PM   #24
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Goodman 18 SEER heat pump problems


just checked on the unit, and the power wire to the compressor is routed through in that ring . The tech guy told me its probably the bad control board ...
Now even if he disconnecting the wires from the compressor , the breaker tripping right away . He was not able to see any flashing error codes on the unit . As soon as power applied to the unit , the breaker is tripping ... He contacted goodman , and waiting from respond ...
When your compressor turned on after connected to power, the fun on the heat pump turned on also ?
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Old 11-25-2014, 03:38 PM   #25
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Goodman 18 SEER heat pump problems


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Originally Posted by Joshi View Post
so after you routed the (red?) power wire to the compressor through in that " ring" everything started working ? No more compressor start after power connected to the heat pump ?
I believe yes.
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Old 11-25-2014, 03:41 PM   #26
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Goodman 18 SEER heat pump problems


Quote:
Originally Posted by Joshi View Post
just checked on the unit, and the power wire to the compressor is routed through in that ring . The tech guy told me its probably the bad control board ...
Now even if he disconnecting the wires from the compressor , the breaker tripping right away . He was not able to see any flashing error codes on the unit . As soon as power applied to the unit , the breaker is tripping ... He contacted goodman , and waiting from respond ...
When your compressor turned on after connected to power, the fun on the heat pump turned on also ?
I do not think that the fan came on. Not sure.

it sounds like you have the same problem that I had. There were some other wiring tricks as I recall but I have no idea what they are now.

I was so happy when I could apply power and the compressor did not come right on.

Which breaker is tripping? What size is it?
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Old 11-25-2014, 03:43 PM   #27
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Goodman 18 SEER heat pump problems


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Originally Posted by fljoslin View Post
I do not think that the fan came on. Not sure.

it sounds like you have the same problem that I had. There were some other wiring tricks as I recall but I have no idea what they are now.

I was so happy when I could apply power and the compressor did not come right on.

Which breaker is tripping? What size is it?

Note that I did all of this myself so contacting Goodman was not an option.

Good luck.
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Old 11-25-2014, 03:45 PM   #28
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Goodman 18 SEER heat pump problems


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Originally Posted by fljoslin View Post
Note that I did all of this myself so contacting Goodman was not an option.

Good luck.
Looking at your original post about this. I do not think that my compressor ever shut itself down. I am pretty sure that I shut it down knowing that it was not working correctly. That may have caused an issue or triggered some protection.

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