Our tappan air handler using a 5 amp fuse that keeps blowing causing the thermostat to shut off. THe handler stills blows air but the heating coils cannot kick on without the thermostat. The thermostat is tied in with the air conditioning on the breaker box and the air handler is on a seperate breaker. We have replace the 5 amp fuse several times and it has blown each time. We have shyed away from looking at the air conditioner unit as a problem but we aren't sure what to look for. Do you have any suggestions before we seek professional help?
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Re: fuse blowing on tappan air handler
Most of the time its out by the ac unit . you have a shorting thermostat wire .. the outside unit has a large wire thats 240v and a small one that 24v thats the one you want to look at . look for bare wires , look where it goes into the wall , thats the common place . "critters" love to chew thermostat wire . so take a look . .....please rate this answer , i need votes . thanks
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There is a 3 or 5 amp fuse on the control board inside the air handler. Disconnect power to the air handler,locate the fuse and replace it with a good fuse. The fuse is the same type used in automobiles. You can purchase them at a auto parts store. After replacing and turning on the power there will be a 5 minute delay before the board and thermostat energize. After 5 minutes set the thermostat for you heat or ac function. If the new fuse blows a complete diagnostic must be done to the system.
Disconnect the yellow wire from the thermostat and tape off the end. Turn the power back on. If the fuse blows, it is not in your wire nor the compressor contactor. If the fuse does not blow, turn off the power, reconnect the wire, and replace the fuse. Then, disconnect the wire from the compressor contactor and tape it off. Turn the power back on. If the fuse blows, it will eliminate the compressor contactor coil and will likely be a "short" in the wire itself. The yellow wire goes from your T-stat to your air handler and from your air handler, it goes to the oudoor unit's compressor contactor.
It sounds like the thermostat wire going to the condenser is ground, It either got pulled loose and is touching the housing or as in most cases the wire got cut or was chewed by an animal. You need to turn electric off to both devices and physically inspect the thermostat wire going from the air handler to the outside unit, also inspect where they connect inside the unit. When you find the break, cut and strip each individual wire and securely wire nut each conducter red to red white to white and so on. There you go all fixed. That's when I give you the bill for $75...except this time you write that check to yourself. Good Luck
Sounds like it could be a very weak run capacitor on the blower motor. Run capacitors are sized specifically to the needs of the motor. When a run cap gets weak, the motor trys to compensate for it by drawing more power. More power draw = more heat in the motor, then the motor will overheat and shut off to protect itself. When the motor cools off it will automatically restart and run until it overheats again. Keep in mind that I am a technician that normally diagnoses equipment in a hands on manner. There are many practices and concepts that transcend all air conditioning systems but it is a constantly evolving industry. I live in south eastern WA and I don't see Amana units except as window units. It is possible to have something else causing this problem (faulty thermostat, failing thermal relay(if used), problem with electronic controls(if used)) there are a lot of potential variables