Please give make, model, year etc of RV that furnace is in. Thermostat on wall operates heat and cool?
SOURCE: ATWOOD MOBILE FURNACE RUNS WHEN IT WANTS/
Check your furnace for power. will be 4 wires. power ground and 2 thermostat wires. Check for power at the time delay relay, if you have power there check for power going in the fan motor, if power in motor wire, motor is bad. If no power in motor wire and power going to circuit board take the 2 thermostat wire apart and wrap the 2 together comimg from the thermostat. Fan will stat in about 30 seconds. If it does you need a control kit in the ac. But sounds to me like you have a furnace problem.
SOURCE: unit runs fine until it reaches temp and then you
Sounds like either the temp unit or sensor may need to be replaced. You should also check the resistance of your relays with a multi-meter to check that they are not causing the problem. Checking the power from power-supply would probably be a last thing to check for.
SOURCE: Air conditioner won't run. when
That hum making the lights dim as well I suspect sounds like compressor trying to come on. Are you sure you have a good 120volts coming in to RV?
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