Robertshaw 9520 fuse blowing - http://www.hvacmechanic.com/ Forums
Original message
| gaffer
 |  "Robertshaw 9520 fuse blowing"
, posted Sat 26 Apr 23:49  
The fuse in my Robershaw 9520 thermostat is blowing. Any tips on where to look first for the issue?
Thanks,
Warming up....
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Replies:
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| Houston204
| "Re(1):Robertshaw 9520 fuse blowing" , posted Sun 27 Apr 05:41
"Tip of the Day" Remember to remove power first.
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| | gaffer
| "Re(2):Robertshaw 9520 fuse blowing" , posted Sun 27 Apr 14:35
Houston204,
All wiring looks good. Even took off the outdoor unit wiring cover and all connections are good and all wiring looks good.
Air handling unit fan will run fine in "ON" position with thermostat if off position. Once turn to A/C - fuse blows.....
P.S. - thanks for the reply....
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| | Houston204
| "Re(3):Robertshaw 9520 fuse blowing" , posted Sun 27 Apr 15:35
Remove the 2 wires to your condenser at the furnace and give your stat a cooling demand. If you still have a short, it proves that the short isn't in the condensor wire or condenser.
If the short isn't present when you isolate the 2 wire to your condenser... You might look down into the condenser to verify that a pressure switch wire hasn't shorted to the hot gas line.
Is this a heat pump?
"Tip of the Day" Remember to remove power first.
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