I installed a goodman 2 ton heat pump 2 months ago. heat and cool mode works fine but will not go into defrost. installed a new defrost board today still does not work. checked voltage at the condencer and air handler the thermostat wires have at least 24 volts at each wire . what could be the problem? thanks Tim
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If the unit is running in cold weather than there is ice building up on the coils located outside. This is normal in that the unit is running in heat pump mode heating inside and cooling outside, After the unit detects the ice build up it briefly reverses the cycle heating the outside coils melting(defrosting) the ice which you observe as water on the pad.
Turn the power off to the heat pump and get a magnifying glass. There is probably only one board inside the outdoor unit anyway, but look closely through the magnifying glass and you should see a set of tiny needle size pins....maybe two rows of 4 parallel pins. There should be a black plastic jumper across a set of pins corresponding to the defrost length. Near those pins and written on the board there will be something relative to defrost duration. This is why you need the magnifying glass especially if you have any trouble with close up vision.
There is probably not a setting that is adjustable for the intervals between one defrost cycle and the next as they are typically initiated not on elapsed time, but on temperature of the outdoor coil providing input to the board that defrost is necessary.
You say 2 to 3 years... I'm assuming the unit is older than that. Especially being r22. What about the first 10 years??? Normally you will get 400 to 500 sqft per ton of cooling, but, that depends on heat load calculations. If the unit wasn't big enough you would have had this issue 10 years ago, not when the system kept running low on refrigerant. At first guess I would say a 2 ton unit is not big enough but if it worked fine for 10 years...wuth all that in mind, if it were me, (a seasoned professional) I would spend 1800 to fix my 15 year old r22 unit before I spent $4000 on a new r410a piece of junk. Best Wishes!!
first confirm that the condensing unit outside is getting power or even a command to come on .check function of thermostat your t-stat may command heat in the cooling mode.instead of the heat mode, being a heating system generated by a cooling condensor. also check bateries in t-stat. make sure breker in the panel box is on ,it is a double breaker usualy marked with an amp rating of 20 ,or a 30 on it . also check disconnect switch located next to your outdoor condensor usualy a gray box on wall of building. make sure its on or diconnect tab is pluged in . hope this was helpful. good luck.
The reversing valve may be stuck. It allows the unit to switch between heating and cooling. You may be able to give it a tap but only on one of the ends, not the sides, and only lightly. You could also unplug the reversing valve from the circuit board. Some reversing valves are energized in heat mode some in A/C mode. When you unplug it, if it shifts, you will hear a loud hiss as the valve shifts and the pressure equalizes.
That does not sound normal at all, I have a Goodman Heatpump and the Fan on the Evaporator (outside unit) should run as soon as it starts up! The only delay you should be seeing is when the unit starts, the fan in the AHU starts 5 seconds after and runs for about 1.5 minutes after shutdown.
First of all is this unit a heat pump i'm not up on goodman model #'s if it is a heat pump reversing valves do go not a real common problem 1000.00 is excessive i would be inclined to get a 2nd opinion. plastic over the sand could create a condensation mold problem. Good luck. Tom
I'm not sure of the kilowatts. The 10 min on and 5 off is telling me there is to much heat by the thermostat or you house needs more insulation. The new compressor is designed for more efficient run time. The other thing is the unit to big for your house? It should run 10 -15 min when low humidity is in the house. Otherwise longer if its pretty warm inside.
Yes. The defrost cycle of a heat pump is actually turning on your airconditioning to heat up the condenser to thaw it out. During this cycle your electric strip heaters "should" be adequate enough to compensate for the a/c being on. At about 30 - 34 degrees outdoor temp there is not enough heat in the air to to adequately heat your home with the heat pump only. Some technitions will use an outdoor thermostat to turn off the heat pump when it is under 34 degrees outside. If you are to cold when its under 34 degrees intall more electric strip heaters.. But if you do this your electric bill may go up significantly.
Welcome to the wonderful world of electric heat pumps (lol).