Question about Heating & Cooling
I installed a new masterstat control box and thermostat. The thermostat works fine but the cooler doesn't start up. It has a plastic control box. Do I need to attact the ground wire coming in from the power souce to a metal surface?
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Posted on Jan 02, 2017
generally ther thermostat is the "brain" of the system, check the wiring diagram (if there is one) or the wiring and see if the on off swtch is inseries or parallell to the thermostat, (should usually be in series if it is I would say that the on off switch is the culprit. you cna verify with an ohmmeter to see if it is staying in the closed position.
Posted on Jul 19, 2009
SOURCE: thermostat wires dead
If you have a split system (an air handler that blows air into your house and an outdoor unit that has the compressor and condenser coil/fan), then you should look in the electrical compartment of your indoor unit and see if you can locate a low voltage fuse. This is usually located on the control board or between the transformer and "R". Make sure you shut off the power to your indoor unit first as they will still be 240volts available there. If the fuse is blown, replace it and reinstall your thermostat. Turn the power back on. If the thermostat is wired properly with no damaged wires in the process, the system should work fine.
If there is NO fuse, then check the low voltage side of your transformer using a Voltmeter. You will have to have the power on to perform this test. Be very careful. On one side of the transformer, you will read 240volts. The other side should read 24 volts. If there is no voltage on the 24volt side, you blew the transformer and will need to replace it.
Check these items first. If you need further assistance, let us know and we will dig a lil' deeper. :-)
picture of a typical transformer.
The low voltage fuse could be a glass cartridge fuse (systems typically older than 15 - 20 years old). Newer systems use the same style fuses that are used in your truck or car (ATC type).
Posted on Apr 08, 2010
Testimonial: "it was a blown transformer thanks!"
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