Ask Experts Questions for FREE Help !
Ask
    jclarkrn's Avatar
    jclarkrn Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Aug 21, 2008, 01:53 PM
    Blown fuse
    The 3A fuse in the heating and cooling unit keeps blowing. I have replaced the control board in the unit and it continued to blow. I ran new wire from the control board to the contractor, and it continues to blow. I disconnected the Thermostat wiring to the control board and jumed the R and the Y connectors to by pass the thermostat and the fuse blew. If it turn the unit off at the Thermostat the indicators lights come on and the fuse does not blow. I switched the unit to heating and the fuse blows. I am thinking my problem is with the transformer. Any helpful hints
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
    		  
    #2

    Aug 21, 2008, 03:07 PM
    I'm thinking you have a control wire short(s). If it does it on heat and cool cold be fan contactor coils shorted.
    Remove wires from outside compressor contactor coil, if it blows on cool, it is likely control wiring to outside contactor.
    Disconnecting wire to heat contactor will help determine if contactor or wiring, don't increase the size of the fuse.
    jclarkrn's Avatar
    jclarkrn Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Aug 21, 2008, 03:44 PM
    Quote Originally Posted by jclarkrn
    The 3A fuse in the heating and cooling unit keeps blowing. I have replaced the control board in the unit and it continued to blow. I ran new wire from the control board to the contractor, and it continues to blow. I disconnected the Thermostat wiring to the control board and jumed the R and the Y connectors to by pass the thermostat and the fuse blew. If it turn the unit off at the Thermostat the indicators lights come on and the fuse does not blow. I switched the unit to heating and the fuse blows. I am thinking my problem is with the transformer. Any helpful hints
    After more testing I found the Thermostate must have a short. And my control board was bad. It must have had a power surge or a storm whiel I was away from home. I disconnected the thermostate and joined the red and white and the heater worked and then joined the red and green wire to test the AC this also worked. Tomarow will purchase a new thermostat. I hope this may help someone else in the future.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #4

    Aug 22, 2008, 05:16 PM
    When you jump from R to G that makes the blower run, If you jump from R to Y that's the compressor circuit. You may still have a short if that circuit was not tested.
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Blown fuse [ 2 Answers ]

I own a 1998 honda accord EX with an OEM factory alarm Every now and then my alarm would start on its own. (Lights and horn on/off). One day I came to start my car and could not disengauge the park. Had to use shift release. The cruise control brake lights and horn would not work. When I...

Blown Fuse [ 1 Answers ]

A brief background before the problem occurred. This morning I was caught in a traffic jam, wherein I had to idle the car for about 15 minutes. Thereafter the driving was normal until I stopped at a traffic signal for over 145 seconds. This time I had switched off the engine. I was unable to...

Blown fuse? [ 3 Answers ]

In one bedroom, we set up a relatively small air conditioner and a fan in the same (double) outlet, and a nightlight across the room in another outlet. Everything ran fine from 6pm until 2:30am when these three things went out. This room, we think, is on the same circuit as our dining room, but...

Fuse blown [ 6 Answers ]

My central ac unit upstair (Goodman-zone 2) keeps blowing its fuse. What troubleshooting can I do to resolve this issue.

3 amp fuse blown [ 2 Answers ]

I have a Carrier Gas Furnace that is blowing the 3 amp fuse for the secondary 24 Vac. I have replaced the fuse and after the heat is on for awhile the fuse will blow and then I have cool air blowing. Please advise on how to troubleshoot problem.Thanks

View more questions Search