Replies

1. 
   DanH | Jun 21, 2007 04:49pm | #1

   Is the outside unit actually running? Can you tell if the compressor is running vs just the fan?

   Is there a detectable temperature difference between the two freon pipes?

   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin
1. 
   woodenhead | Jun 21, 2007 06:24pm | #2

   Both the compressor and the fan are not operating, as for the temperature difference dont know. Thanks

1. 
   DanH | Jun 21, 2007 06:50pm | #3

   Well, if neither is operating and you're confident that juice is getting to the box, the thermostat would be the first suspect.
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

2. 
   RobWes | Jun 21, 2007 09:19pm | #4

   I have a Sanyo Tri Zone. I have fuses in the compressor unit. Have you looked in there?

   Had a mouse once eat thru the wires till he grounded out. Blew the butt right out of him.

1. 
   DanH | Jun 21, 2007 09:59pm | #5

   Also, many units have an overload cutout -- a sort of resetable circuit breaker. Generally there's a rubber "button" on the unit to reset it.
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

1. 
   woodenhead | Jun 23, 2007 09:16pm | #6

   There is a very small fuse on the circuit board that looks like it has blown. Can it be replaced, or do i have to replace the whole circuit board? Friedrich Model # MR36TC3E Outdoor unit.

1. 
   DanH | Jun 23, 2007 10:37pm | #7

   A small fuse like that doesn't blow without a reason. In addition, often small fuses look like they're blown when they aren't. I think you're groping in the dark -- time to call a pro.
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

1. 
   woodenhead | Jun 24, 2007 06:36pm | #8

   Checked fuse with ohm meter test open.

2. 
   DanH | Jun 24, 2007 09:11pm | #9

   What is the fuse protecting, and why did it blow?
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

3. 
   woodenhead | Jun 25, 2007 12:36am | #10

   A this time i do not know. When i find out i will in form you. I sent an e mail to Friedrich.

   Edited 6/25/2007 11:36 am ET by woodenhead

4. 
   woodenhead | Jun 25, 2007 06:35pm | #11

   I was told by Friedrich that a probable cause for the fuse to blow was a power surge. Must replace the circuit board $300 + labor. You would think that they would make it so the fuse could be replaced and not the circuit board. Any comments on how i can protect the unit from a future power surge.Thanks to all.Edited 6/25/2007 11:37 am ET by woodenhead

   Edited 6/25/2007 11:38 am ET by woodenhead

5. 
   DanH | Jun 25, 2007 07:07pm | #12

   Dunno, but they obviously have a defective design. Normally the circuit board blows to protect the fuse.
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

6. 
   BillHartmann | Jun 25, 2007 07:43pm | #13

   First you have to realize that "probably caused by a surge" is code for how in the h*ll are we suppose to know what happened to a board that we haven't seen and haven't the slightest idea what is wrong.The purpose of the fuse it prevent from damage from a bad board. Now it is possible that the fuse, itself, was defective or misdesigned. But most likely some other part on the board has failed and the fuse prevents more smoke and flames.That other part(s) would need to be replaced before the fuse is replaced. That part might have fail because of a surge or maybe from other causes.If you want you can install whole house surge protector at the main panel. Cost about $100-300. Would not hurt and with all of the electronic controls on equipement it might be worth it.But even if the problem was a surge the whole house surge protector is no absolute guarantee as there are so many different kinds of surges and how they can be introduced into the home wiring.
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   A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.