Question about Heating & Cooling
.I have no power to my thermostat and after testing the out wires of the transformer i only have 19.4 volts??? Does this mean this is my problem? Also there is a flashing led light in my heat pump that is showing an error message of (secondary voltage fuse is open..)
It sounds like you have a short or a ground in the control circuit. Somtimes you can spot a bad component with your eyes. Look at the different relays to see if any looked burned. You might also look for a wire that has came off and is touching ground. You mentioned you put it in auto heat. This could narrow your search to components for heating. The problem could be in the coil on your reversing valve. I don't know if you have any trouble shooting experience, but if you have a multimeter you could do some resistance checks to find the problem.
Posted on May 09, 2010
Assuming you are talking about a transformer that puts out secondary voltage of 24V (and I think you are) - then your voltage reading at the transformer is within guidelines.
The flashing red light seems to be telling you that you have a fuse blown in your secondary voltage circuit which under normal circumstances would disable your t-stat. I would try and find a fuse in that circuit and check and see if it is good or not.
If it is bad - you need to replace it - but you also need to determine what blew the fuse.
Sometimes fuses blow on their own and the reason cannot be determined, but most of the time there is a reason that the fuse blew in the first place.
It may be that you need an experienced troubleshooter to figure out your problem but I would at least try replacing the fuse and see if the unit operates properly from that point on.
If it blows another fuse then you will need someone to trouble-shoot the problem or submit more information to this site for some additional help.
Posted on May 03, 2010
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Posted on Jan 02, 2017
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