Question about Heating & Cooling
I had no power to my thermostat.... there was a LED light blinking an error code that said secondary fuse open.... ichecked inside the panel area and there was a blown fuse on
the circuit board, after i replace the fuse...the LED light was on continuously which said the system was getting 24v...I set the thermostat to fan and it kicked fan on, i set it to auto and set the heat up but it would not kick on.. then i went back down and both the internal circuit board fuse and external circuit board fuse were blown???
This has happened because of an Overload, probably a short circuited element, you need to test the element. you should not just ever replace fuses without first finding out why. it happened. Any circuit, of any heater is pretty basic, usually, we have a switch, a thermostat, a thermal fuse, and an onboard fuse, terminating on the element, returning on the neutral. It works basically, by the switch puts power to unit, this powers the electronics, which monitors the thermostat,that has contacts in series in the Phase wire, before the element, when the thermostat's temperature is reached the Contacts, OPEN, and cut power OFF to the element, it cools down, and it turns ON again, over and over keeping the temperature constant. There is a Power fuse, in case of a short circuit, or overload, and generally an "Over heating" or "Thermal Fuse" too. All fuses are in the Phase Line, and break the circuit when activated.
Posted on May 09, 2010
Replace the fuse after reading the fuse specification in thermostat manual....
If the fuse is heavy bonded, then it will not blow when there is a need.... It will make other components to blow....
So replace all the fuses only according to the specification...
fuses varies according to the thickness off the wire used in it...which is directly proportional to the resistance....
so use only recommended fuses with recommended value...
Posted on May 10, 2010
You must have a shorted thermostat wire somewhere. Turn the thermostat off and check for continuty between the wires coming from the stat. You should have no continuity since that stat is off amigo. If you have continuity that would confirm bad thermostat wires.
Posted on May 09, 2010
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Posted on Jan 02, 2017
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