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Armstrong air ultra v tech 80

Fuse on pcb blows when activating air conditioner. heater works fine. i have 27.5 vac from transformer to pcb

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 18 Answers

SOURCE: Heater blowing out cold air

Yes you could have a bad overload on the heater element which is fairly simple to fix. To test for this pull the heater out and get an ohmeter set it to continuity and check the continuity first through the entire heater element then if there is none pin point the overloads and check to see which one has no continuity.

Posted on Dec 23, 2007

yalmer
  • 549 Answers

SOURCE: Carrier Thru-Wall Heater and Air Conditioner won't heat

http://www.residential.carrier.com/support/troubleshooting.shtml
Here is some troubleshooting tips.
Also service available.

Posted on Feb 25, 2008

  • 306 Answers

SOURCE: armstrong ultra sx 80 furnace

Flame sensor could be dirty. It is located right beside the last burner looks like a thick piece of wire. Take steel wool and gently clean the probe 4 or 5 strokes is all it will take to take off the carbon build up off. Lets eliminate this item and see if it clears up okay. ken

Posted on Dec 21, 2008

  • 306 Answers

SOURCE: armstrong ultra sx 80 furnace

You have a dirty flame sensor. Look at the very last burner and you will see a wire going to a ceramic sensor and it looks like a thick wire. Take some steel wool or fine sandpaper and clean the surface off and it will work like a champ.

Let me know how it goes ken

Posted on Apr 15, 2009

  • 127 Answers

SOURCE: Dometic 57915.531 Air Conditioner Blows 3 amp fuse in control box

Steve,

The three amp fuse is installed in the board to protect from shorts or overloads created by disconnecting or reconnecting components when DC power is still connected to the system. If the fuse is blowing, then you more than likely have a short in the 12VDC system between the control unit and the thermostat.

1. Pull the cover off of thermostat and remove the +12 (or +7.5 depending on the model) wire. Access the other end of the wire in the AC compartment. Using an ohmmeter, touch the end of the wire at the AC with one lead and touch the control box with the other (or any ground source). If you get a reading other than OL or Infinity, then that wire is shorted out in the wall somewhere. If not, repeat the steps for the rest of wires except the ground of course. If all of these wires appear to be fine, you may need to take it in for some more extensive troubleshooting.

Hope this helps,

Jeff

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Posted on Jul 04, 2009

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I will assume this system isn't a heat pump since it runs fine in heat mode. If it is, please let me know. Also, I will assume there is no circuit board outside, but let me know if there's one.

Go out to the condenser and remove the Y wire from the contactor, then try the system in cool mode. If the fuse blows, you have a short in the low voltage wire between the air handler and condenser and will need to find it, cut it out, then re-splice. If the fuse doesn't blow, you will likely need a new contactor.

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You have a dirty flame sensor. Look at the very last burner and you will see a wire going to a ceramic sensor and it looks like a thick wire. Take some steel wool or fine sandpaper and clean the surface off and it will work like a champ.

Let me know how it goes ken

Apr 15, 2009 | Heating & Cooling

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