Got a weird one here


  #1  
Old 08-28-09, 05:19 AM
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Got a weird one here

Hello 1st time poster

Have a problem with transformers?

The inside unit funs fine fan and heat works just like normal

when I start the unit for A/C the fan comes on the shuts off then turns back on ( in like 1 min) then the circuit breaker blows on the transformer any help ??

Sometimes everything runs just fine.
 
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Old 08-28-09, 05:24 AM
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Are you talking about the condensor fan motor?
 
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Old 08-28-09, 05:46 AM
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Yes sorry bout that

I can get it to run if I play with the thermastat/fan switch
it is almost like something is overloading the transformer?
when going into cool mode

Thanks
 
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Old 08-28-09, 06:19 AM
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Sounds like a loose low voltage connection. Turn off power and check all connections from stat to outdoor unit.

Verify your getting 24v at secondary side of trans 1st
 

Last edited by dun11; 08-28-09 at 06:21 AM. Reason: forgot somthing
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Old 08-28-09, 06:24 AM
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All checked and all are tight inside and outside

Getting 24 volts...That is untill the outside unit tries to turn on then the circuit breaker on the transformer trips !!
 
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Old 08-28-09, 10:51 AM
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May have a shorted low voltage coil on the condensing unit contactor. Unplug the two low voltage wires from the contactor, be careful not to short them. Then try the ac again. If it still kills the low voltage you have a shorted wire to the condensing unit. If it doesn't kill the low voltage, replace the contactor.
 
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Old 08-28-09, 11:22 AM
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Originally Posted by Skip4661
May have a shorted low voltage coil on the condensing unit contactor. Unplug the two low voltage wires from the contactor, be careful not to short them. Then try the ac again. If it still kills the low voltage you have a shorted wire to the condensing unit. If it doesn't kill the low voltage, replace the contactor.

That was my original thought but wanted to be sure all L/V connections were good first.
 
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Old 08-29-09, 12:49 PM
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if you have any spare wires in the condenser run out from the furnace pick 2 new colors and change them at both ends...even one spare change might do it the R and the C are touching each other someplace on the way out
 
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Old 08-31-09, 05:24 AM
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Thanks All for the help so far

Will check on the shorted wires and or the coil for the contacts
 
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Old 09-01-09, 03:13 AM
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Thanks all

Ok checked everything out

I am now thinking the contactor coil is bad or going

everything runs great till I put the wire on the timer for the condenser... I did put a amp meter on the load side of the transformer it runs around .1 to .3 amps the when I put the wire on for the condenser the amps got to like 5-6 then the circuit breaker blows on the transformer.... What do the experts think

The coil ohms out at around 18ohms
 
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Old 09-04-09, 02:48 AM
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Well it is fixed

Was the wire going out to the unit had to replace it.

It was a tricky one this time I would move it and all was well then it would move back but all is well now

Thanks for the help allBeer 4U2
 
 

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