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Old 08-29-2014, 11:05 PM   #16
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3Amp fuse on Fan Board blowing!


or disconnect the pressure switches and run straight 24 volts to contactor. I'm not a heat pump expert but I do believe all pressure switches go through defrost board so if you do run straight to contactor the rv may not engage, if that goes through the defrost board, meaning although on call for cool via stat/jump heat would blow as condenser contactor pulls in and hp runs/turns on.

But at least if no pop then we're on the right track.

good luck, please keep us informed.

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Old 08-30-2014, 04:28 AM   #17
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3Amp fuse on Fan Board blowing!


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or disconnect the pressure switches and run straight 24 volts to contactor. I'm not a heat pump expert but I do believe all pressure switches go through defrost board so if you do run straight to contactor the rv may not engage, if that goes through the defrost board, meaning although on call for cool via stat/jump heat would blow as condenser contactor pulls in and hp runs/turns on.

But at least if no pop then we're on the right track.

good luck, please keep us informed.
The RV would be unaffected. The pressure switches are only in series with the Contactor's coil.
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Old 08-30-2014, 07:32 AM   #18
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3Amp fuse on Fan Board blowing!


Just in case I miss interpreted RV means reversing relay, right?
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Old 08-30-2014, 07:46 AM   #19
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3Amp fuse on Fan Board blowing!


Reversing valve...
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Old 08-30-2014, 07:48 AM   #20
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3Amp fuse on Fan Board blowing!


That will be a component in the refrigerant line? Or on one of the boards?
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Old 08-30-2014, 09:33 AM   #21
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3Amp fuse on Fan Board blowing!


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Old 08-30-2014, 11:05 AM   #22
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3Amp fuse on Fan Board blowing!


I had a similar situation happen at one of my rental units with a 3 ton 13 seer train. Unbeknownst to the landlord ( me), the tenant a cable-guy tech had been going into the attic to replace fuses on the board because the air handler would stop working every few days. Finally he calls me to say the AC isn't blowing and the pipe outside (suction line) to the compressor was frozen, so he tried to thaw it by peeling off the insulation. When I arrived I noticed the blower was barely working, the return air filter was was a thick HEPA type and full of dust (removed it). Also noticed that there were several auto type fuses laying on the unit blown ( 10 amp I believe). The blower was turning slow and I noticed the blower capacitor was leaking. Diagnosis: the matted return air filter placing a too much a load started blowing fuses, fallowed by a partial fan capacitor failure. After replacing the return air filter with a high- flow (no more HEPA) and a new capacitor, the unit worked fine and stopped blowing fuses.
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Old 08-30-2014, 04:49 PM   #23
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3Amp fuse on Fan Board blowing!


OK, so I checked the coil on the reversing valve and it ohms out at 16.5... I'm assuming that means it is OK and no shorts to ground.

Next I ran it with the RV disconnected and manually depressed the contactor. This was while the thermostat was calling for cooling. Compressor fired up (though I assume it was heating)...no other problems...so, what do you guys think?
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Old 08-30-2014, 04:56 PM   #24
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3Amp fuse on Fan Board blowing!


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Just disconnect the RV coils wires from teh defrost board and ohm them out.
Hey, 16.5 is what I read & no short to ground...see my last post.
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Old 08-30-2014, 05:05 PM   #25
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3Amp fuse on Fan Board blowing!


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Originally Posted by russkateer View Post
OK, so I checked the coil on the reversing valve and it ohms out at 16.5... I'm assuming that means it is OK and no shorts to ground.

Next I ran it with the RV disconnected and manually depressed the contactor. This was while the thermostat was calling for cooling. Compressor fired up (though I assume it was heating)...no other problems...so, what do you guys think?
Quote:
Originally Posted by russkateer View Post
Hey, 16.5 is what I read & no short to ground...see my last post.
The compressor contactor? Why didn't the thermostat energize the contactor for you? Did you measure between the RV coil and ground?
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Old 08-30-2014, 05:40 PM   #26
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3Amp fuse on Fan Board blowing!


Yes, between ground and either side of the coil was open when disconnected from the defrost board.
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Old 08-30-2014, 05:40 PM   #27
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3Amp fuse on Fan Board blowing!


Not sure why the fan board wasn't energizing the contactor....I'll look around.
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Old 08-30-2014, 05:45 PM   #28
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3Amp fuse on Fan Board blowing!


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Originally Posted by russkateer View Post
OK, so I checked the coil on the reversing valve and it ohms out at 16.5... I'm assuming that means it is OK and no shorts to ground.

Next I ran it with the RV disconnected and manually depressed the contactor. This was while the thermostat was calling for cooling. Compressor fired up (though I assume it was heating)...no other problems...so, what do you guys think?
Never energize a coil while there is no load on it. As it tends to burn out the coil.

Does that mean you didn't wait the 5 minutes for the board to pull the contactor in, or it didn't pull in.
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Old 08-30-2014, 05:46 PM   #29
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3Amp fuse on Fan Board blowing!


Been running for 15-20 min and hasn't pulled the contactor in yet.
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Old 08-30-2014, 05:49 PM   #30
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3Amp fuse on Fan Board blowing!


No loose wires, not sure why the contactor isn't pulling in...? Actually the connector that I removed from the defrost board has a blue wire which may be the same one energizing the contactor...I'll check schematic.

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