AboutJ Cook Expertise With 25+ years experience, I am familiar with residential, commercial, and industrial HVAC equipment including but not limited to boilers, chillers, reciprocating and screw compressors. I am trained in all manners of control wiring.
Experience I currently have three HVAC licenses and Refrigeration license by the State of North Carolina. I have been in this field for over twenty years. I have been a service technician for a contractor and also worked at a state college in the repair and maintenance of steam lines and equipment. I am currently the Building Maintenance Superintendent for a municipality.
Question Hi. What could be the problem is the thermostat on the wall has no power? The AC unit itself as power, but when going through the contacts within the unit, its reading 0..on both the good and bad units (there are 2 units, one is working the other is not). Thank you.
Answer The thermostat receives 24 volt power from the internal transformer. Locate the transformer and make sure it has 240 volts on the line side and 24 volts on the outgoing side. If it does not have 240 volts, there is a line voltage problem, if it has 240 volts but 24 volts is not leaving, it is defective. Thanks J
