It could be the high speed heater motor relay is stuck on or the switch itself is broken.
I have a 2002 Jeep Grand Cherokee Laredo that was doing the same thing. The problem was a faulty ac/heater switch. You put the switch on ac, compresser engages, lines get cold and frosty, but only hot air is coming out of the vents, because the switch has changed back to heater even though it shows ac. The cure is to have the center panel which contains the ac/heater switch, fan speed switch and temperature control replaced.
There is no known cure for epilepsy, though there are treatments that may help to control it.
Sounds like a switch that would only provide power if a condition is met, i.e a lamp timer. I'm not positive though.
It could mean that the High Limit Switch has failed or is about to fail. You should call a qualified swimming pool tech to trouble shoot the that heater control component. If he should fine that it is indeed faulty - replace it. He should further check ALL the other components to make sure that they are performing to their potential or to factory specs. This service could save you $$$ in the long run. The heater is trying to tell you something ~ and that is to get it serviced soon. A failed High Limit Switch could perceivable let your heater run or fire or continue to burn even though the pump has shut off. And as you may have already found out ~ nothing works unless the pump is working or running. k
If you are talking about motor control then the answer is yes. There are two things to take into account though. One, is the motor thermally protected. This is for overload protection. On fractional HP motors it will indicate this on the nameplate. If the motor is not protected, then a fractional HP motor switch should be used. Incorporated into this switch is a heater element that the motor current flows through. If the motor current gets over the motor nameplate rating then the heater trips the switch and shuts the motor off. The other thing is that the switch has to be motor rated, currents and voltage matching the motor nameplate ratings. The specific switch has been designed to open motor currents under full motor loads. An ordinary house light switch is not motor load rated and should not be used for this purpose.
When the heater resistor goes, your climate control fans will only work on the fourth setting. You can get a new resistor from any Ford Lincoln Mercury dealer, though they may have to order one.
Check the fuse, if this is Ok it is possible the mechanism has jammed OR the main switch (On the drivers side door) needs replacing. Try taking main switch out disconnecting it and then putting it back in, this might re-set it, if this doesn't fix the problem, you likely need a new main switch. (Check fuse first though)
Heater core plugged? Heater core airbound? Thermostat not opening to allow coolant flow?
Not... permanently? He became a weiner once, though.
Not permanently, though he does have a vacation home there.
not very, lots of quirky items with coolant loss via heater control valves or engine oil coolers. Nice cars though available at a great price.
If the process that gets the control can be put into the register (its kept in cache though) means less time to fetch and have a context switch. Any way the context switching time isn't a big time delay.