nordyne m1m A/C Problem
Hi I have a nordyne m1m unit and the A/C side will not work, the Heater works, but not the A/C. when I turn the A/C on the red LED goes off and the Transformer ges really Hot. any help would be appreciated
Sounds like you have a short in the low voltage wiring. The transformer should be warm but not hot. I would check the low voltage wiring for any shorts or where it has rubbed thru.
God, grant me the serenity
to accept the things I cannot change;
the courage to change the things I can;
and the wisdom to know the difference.
to accept the things I cannot change;
the courage to change the things I can;
and the wisdom to know the difference.
The red led light off means no power. When it does this, test across COM and 24V on board to see if you have 24-28vac.
If not, test across 24V secondary side of transformer for 24-28vac.
If you have it at the board:
Trace the two low voltage wires from the outdoor condenser contactor coil (2 small wires connected to sides of contactor).
Trace them back inside checking at all connection points for 24-28vac.
If they return back to board, see if the 24-28vac is exiting the board going to those two wires.
Because the Furnace works for Heat, the 24vac low voltage circuit is thre, but may be getting shorted somewhere along the circuit.
Find last place that it was present and the problem lies between there and next junction/connection where it is not present.
It could very well be the board.
Take care and best wishes,
Robert
If not, test across 24V secondary side of transformer for 24-28vac.
If you have it at the board:
Trace the two low voltage wires from the outdoor condenser contactor coil (2 small wires connected to sides of contactor).
Trace them back inside checking at all connection points for 24-28vac.
If they return back to board, see if the 24-28vac is exiting the board going to those two wires.
Because the Furnace works for Heat, the 24vac low voltage circuit is thre, but may be getting shorted somewhere along the circuit.
Find last place that it was present and the problem lies between there and next junction/connection where it is not present.
It could very well be the board.
Take care and best wishes,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
Well now I am noit getting the 24VAC on the transformer, I still dont think it is the transformer. I replaced it with a new one, now is not getting Hot but is not providing poer to the unit, I have 124VAC, I belive that the circuit board is bad. This unit is nothing but Problems, and is only 4 years old
Here is the board
and the transformer
Here is the board
and the transformer
Are you saying you have 124vac on the primary side of transformer, but do not have 24vac on the secondary side (top) ?
Do the tests as detailed in previous post.
Thanks,
Robert
Do the tests as detailed in previous post.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
you mean this one?
viewtopic.php?t=408
Also the Heater is not Working now, I still do not have 24VAC on the secundary
viewtopic.php?t=408
Also the Heater is not Working now, I still do not have 24VAC on the secundary
Reread my previous posts and follow those steps. If you have 120vac at Primary side of transformer and do not have 24vac at Secondary side, the transformer is bad.
Note that another problem could have caused this and replacing the transformer only could destroy another transformer.
Take care and best wishes,
Robert
Note that another problem could have caused this and replacing the transformer only could destroy another transformer.
Take care and best wishes,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
Still not working, I am ordering a new transformer, Before this all happened, the aux limit switch had gone bad, I just bypassed it, I do not belive that this caused my problem. But who knows, Robert can you be specific to what thread to look at for troubleshooting?(Link)
Thanks
Thanks
Hi,
The steps I referred to are my replies in this thread.
Get a automotive type ATC 3 Amp fuse and inline fuse holder and splice it into the HOT wire coming from secondary side of transformer.
That will protect transformer should problem be a short somewhere.
Thanks,
Robert
The steps I referred to are my replies in this thread.
Get a automotive type ATC 3 Amp fuse and inline fuse holder and splice it into the HOT wire coming from secondary side of transformer.
That will protect transformer should problem be a short somewhere.
Thanks,
Robert
Some people are Humbly Grateful, while some are Grumbly Hateful.................... Which one are you ?
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