It has been explained to us that the thumping (sounds like a small tom-tom) is to be expected when the unit is defrosting. Now that we've hit the 30 degree mark this is happening every night.
The problem is the noise. Last night I was awoken at 4:30 and again at 5:45 (we have two units- not sure of the culprit). I can understand the need for the cycle, but I can't believe it was designed to be so noisy it would wake you up! The units are outside at ground level, free standing house; bedroom is on 2nd story, same wall as heat pumps.
The heat pump works like this. Your outdoor units are now your evaporator, meaning that now they get cold, they will build a layer of ice and they will need to go thru a defrost cycle, either iniated by time or temp. When the cycle starts your system actualy switches back into cooling, turns off your outdoor fan, and brings on your heat strip. The noise you hear is either you reversing valve switching or the ice being melted, then being sucked back into the fan when your unit switches back into the heat mode.
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Question. Is the flapping at a very fast pace that would indicate the speed of a fan blade hitting something? If so, you may be on to something there such as a misplaced gasket or something has dropped/fallen into the blower box via a vent.
If it is not that speed then see the following..
Hope I can give you some direction. Speaking from a generic sense all ac/heaters these days have a door or doors in the blower box that control air flow from the main part of the box to different positions when you ask for vent, heater, mix, defrost etc..
Most these days are operated with a small electric servo/motor and unfortunately the mostly have plastic gears that wear and can "thump-thump" as the motor cycles trying to open or close the flapper door.
Try to change the air direction from Max AC to regular ac to heater, defroster, bi-level etc all with the AC switch in the on position if you have a separate on/off switch.
Listen to the sound and see if it comes and goes with a different location of the selector switch.
One last question. Does it happen at idle or driving down the road at any particular speed?
Lets start with that and see what happens. This is interesting.
I'm not sure what you mean by "Thumping". Please explain if this thumping is engine or body related. Try to describe the symptoms with more detail. Thumping to me, could refer to a Random Misfire, Internal transmission failure, Using the 4WD while on the wrong road surface or the tires are not all the same size, a defective U-joint (in the drive-shaft), a defect inside the rear drive-axle (ring&pinion), maybe a defect in a tire (not balanced or a bubble in the side-wall or tread), wheel bearing, ball-joint, tie-rod, or a needed alignment (observe if the vehicle pulls to one side and look for irregular tire wear). Let me know, good luck.
Probably the same issue I am having with the A/C actuator. Move your selector from dash vents to floor vents, then to defrost and see if the sound stops. Mine is stuck on either floor or defrost right now, won't direct air out through the dash vents. The gears in the actuator motors strip and the thumping will get worse until the gear is finally worn down and won't work at all.
Not sure which model year you have but check for a small reset button on bottom press and hold it with a paper clip or similar. Also try holding the power button for a minute to see if it reboots, try removing the memory card first. If it starts don't insert the memory card until the unit is off. If that still does not work click on the link below which will explain the reset in detail. Thanks for using FixYa
Check your defrost components. The fan is hitting the frost buildup and will shut off when the door is opened so as to not circulate the warm air. The heater or the timer is not doing a proper defrost cycle. Eric
there is a reset button on the bottom of the unit ,take a paper clip or pin and pus in for abut 30 seconds then try to turn on.the reset is a small hole about a 1/4 inch from front of unit on bottom it says reset withan arrow pointing to hole