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The 3 amp fuse blowing indicates some control function is either grounding out (probably a worn insulation on control wire) or one or more of the solenoid controls is pulling more wattage than it is designed to draw. The solenoids for the main contactor and reversing valves should only draw about 0.1 to 0.25 amp. Any more than this the solenoid overheats and causes the control fuse to blow. I have actually had to replace the thermostat wire on some units because the control that was pulling more than designed caused the entire length of thermostat wire to overheat and break down the insulation, causing the control wire to short to the common wire or others and cause more than required operations to occur simultaniosly. One unit had a short and emergy heat was coming on the same time cooling was on.
There is a contact in the blower control card that can stick on. There is also a possibility that the green wire which starts the blower motor could be shorting out with the red wire somewhere inside the thermostat wire. If that is the problem, either pull new thermostat wire, (the rest of the insulation is probably breaking down) or there is some new red link controllers from Honeywell that will completely eliminate wire because the controls are all wireless.
Heat pumps require a reversing valve for heat operation on the outdoor section, a control signal to a "O" terminal or orange wire is required for heating and cooling depending on the thermostat and out door unit requirements. The thermostat also has to be heat pump type for the system to operate heat for electric system with heat strip, two stage electric heating.
try cleani ng the unit outside with your garden hose first .sounds like its kinda dirty .the dirty er the coil is the higher the amp draw is when it is running .what size is the breaker in the box .thats a 3 an a half ton condensor
Sounds like the heat pump is not running. Check outside to see if the fan is spinning.
Try moving the thermostat to emergency heat and see if that gives you any heat. If it does, then you have heat until you can get a service technician to locate the problem with the heat pump. It could be a wide range if issues from bad thermostat to bad wiring to bad capacitor.
In order to freeze, some refrigerant must be present. The outdoor units compressor overhats and will cut out, the fan stays on, if poor refigernat charge is the problem. This overload will not reset for 1-3 hours, just enough time to defrost and refail again.