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At what voltage? 12 v DC or 110 VAC? Have you checked the circuit breaker in the power distribution panel? Is the outlet the 110 volt cord connected to hot? Is the 12 volt converter producing voltage? The only thing that exists between those components is wire. Look for the not so obvious problems like a wire pulled out of the back of the plug the 110 v cord is connected to or inside the power distribution panel for wiring problems.
It could be one or more of these:
- the cord that goes from the base unit to the phone company wall jack is faulty
- the cord that goes from the base unit to the phone company wall jack is not connected or is not plugged in to the base unit jack labelled 'line'
- the wall jack is not active (ie; does not have phone company dial tone)
The air conditioners on RVs are 110 volt AC. They do not run on 12 volts and should not be run on inverters. You would need at least a 2000 watt generator, preferably 3000.
If you have the power, it requires cutting a 14 inch square hole in the roof. The air conditioner is clamped down by 4 bolts from the inside, part of the internal control package. You would need what is called a "non-ducted" inside unit which would have the thermostat and control knobs.
no ac power you are hearing a 12 volt relay tellling it to come on but there is either no ac power or control ac relay is bad and you will have to replace control unit to ac useually arond 150 depening on unit
If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've determined which 2 they are, join them together & see if furnace starts, as it should. If it does, thermostat is faulty. If not, pull outside cover off & check voltages at furnace. I'm guessing by furnace model that your unit is approx 30 ft , but if it's a park model, you may have 24 volt system on furnace or 12 volt. Another way of confirming is to go to back of furnace where air intake grille is inside your unit, and locate 2 blue wires going to furnace & remove whatever wires are attached to them & connect them together. Furnace should start up.
The 3 amp is 12 Volt protection for the control board. If that fuse is blowing instantly, then you have a short in the 12 Volt system somewhere. More than likely it is somewhere between the Thermostat and the control unit. Check to see if you have 12V at the thermostat. If so, then disconnect the red wire from the thermostat and the red wire at the control unit. At the control unit side, use an Ohmmeter to see if you have continuity with ground. If so, that wire is the culprit. If not, reconnect the red wire and continue to the next wire. Do this until you find the wire that is shorted to ground. Of course, the ground wire will not be checked.
look inside the control panel of the heater. look for a 120 volt to 24 volt transformer. There may be a fuse on the transformer secondary. The thermostat switches a hot 24 volt wire so you won't find a common at the thermostat.
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