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40AQ024 heat pump system. Outside unit does not operate.

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hotuna
  • 288 Answers

SOURCE: ruud heat pump outside fan

You may be right in looking at the motor. It uses a different speed on heat than cool. The heat cycle uses low speed, usually red. Some manufactures use blue (medium). Cool uses black, high speed. If you are confident, switch the low speed wire with the high speed and see if this changes anything. If the fan motor isn't the problem, check the other setting (cool) if the overload trips, you may need to look into a new capacitor or compressor, if so, you can install a hard start kit. these are start boosters, and are inexpensice, sometimes they will give another year out of the comp. but I've put them on and they have lasted 5 years.

Posted on Mar 15, 2008

  • 230 Answers

SOURCE: intermittent blower operation on Goodman

I believe this to be either a bad, miswired, or loose connections on the thermostat or thermostat wires. If this is not the problem then a bad circuit board is probably your issue. A licensed technician can use a amp meter and multi meter to trace this problem. Good Luck.

Posted on Jun 25, 2008

  • 182 Answers

SOURCE: Ruud Heat Pump

this may indicate you have low voltage but no high voltage.check fuses and breakers.

Posted on Aug 09, 2008

pierre1811
  • 144 Answers

SOURCE: heat pump outside unit not running

It sounds like your defrost board failed. You will need a tech to replace it. With that model it may have a parts warranty but you pay labor(?)

Posted on Jan 18, 2009

  • 38 Answers

SOURCE: RUUD heat pump system does not cool properly.

With a heat pump system there are always going to be a back up heat strip inside the Air Handler.

If you detect a faint humming in the Condenser call your local service company and ask them to come and replace your capacitor in the condenser. The humming is from the contactor engaging but not being able to start the compressor due to not having the required Microfarads to start it.

Let me know if this helps

Posted on May 08, 2009

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I assume that you have a heat pump system. If this is the case, the outside temperature is probably lower than the heat pump is sized for and it is using the auxiliary heating system to keep up. The auxiliary heating system usually is an electric coil in the heat pump unit which supplements the heat being produced by the heat pump. This is normal operations and does not indicate a problem with the heat pump, it is just really cold outside. If it is not colder than usual outside, there may be a problem with the heat pump and you should call a heating contractor to check it out.

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Hi,My remote do not get the good temp in my house. Ex: I set to 80F in heat mode but the thermopump operate slowly and dosn't get hire than 70-72F. The remote see the unit and all. Is the sensor in th


You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.

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1 Answer

I have an armstrong heat pump and am curious about how the defrost cycle works.


Rather lengthy but here it is.
The outside unit(heat pump) has a reversing valve, a defrost board, a crankcase heater, a metering device(txv or piston) and an accumulator. This is what makes it a heat pump instead of a straight air condensing unit.
When in the heat mode the outside unit becomes the evaporator and the inside unit becomes the condensing unit.Before somebody corrects me i am just stating what is different in a heat pump.
When the system goes into defrost several things happen. First the system has to call for a defrost cycle. This happens on a time and temperature sequence. When the defrost board times out for a defrost check(the defrost board has a jumper pin to determine how long before the system will check for a temperature(thermal switch) is open or closed. This switch is in the normally open position. It will close at 35 degrees(depends on the switch). This switch is located on the copper line in the condensing unit. If this switch is closed then the system will go into defrost. Now for the good part. This will shut down the outside fan, switch the reversing valve, and the outside unit will essentially go into cool mode. Because the fan is off the compressor will heat up very rapidly and the refrigerant passing thru the coils will be hot as well. This will cause the ice buildup on the outside unit to melt(defrost). This will continue until a temperature is met or it times out. Then the system will return to the heat cycle. One other thing, depending on how your system is wired the inside unit will turn on the auxillary heat while the defrost cycle is in process. That way you will still have heat while the defrost cycle is in process.
It is not uncommon for steam to come out of your outside unit while this is going on. It can also be quiet noisey sometimes.
Hope this explains what you wanted to know. If not just reply to this with any other question you have about the cycle.

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1 Answer

Is it normal operation for these units to EVER blow out cold air or "nonheated" air when unit is in heat mode?


Yes. Heat pumps have to go into defrost just like a freezer when the temp gets too cold outside. The heat pump will temper the indoor air electric heat.

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My outside heat unit is frozen and it is 10 degrees out, will it thaw while I have it on emergency heat? How long do I keep emergency heat on?


Switching to emergency heat will not defrost the unit.

If the Heat pump is malfunctioning, continue to use the emergency heat until the unit can be repaired properly.


At ten degrees, no heat pump can keep up., but it should be automatically bringing on the heat strips as back up heat. (same thing as emergency heat, it's just automatic.)

Either the extreme cold is overloading the defrost system, due to lack of properly operating exterior temp sensors or the defrost is malfunctioning,

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Heat pump and gas furnace running at the same time.


An explanation....

When in the heating mode, all heat pumps are dependent upon the outdoor conditions to remove heat energy from the environment and turn it into useful heat for your dwelling.

Heat pumps operate more effectively in temperate climates (as in southern states) and if it's as cold as you say, then the furnace is coming on to add auxiliary heat to the space to make up for the lack of heat being supplied by the heat pump. This is normal.

Some heat pump systems are or can be equipped with a control known as a "low ambient cut out" and/or "motor master" that prevents the heat pump compressor from operating and slows or stops the condensing unit fan when it's too cold and risking potential compressor damage. When it's in the single digits outside, a heat pump is only marginally effective. and usually requires auxiliary heat (your furnace).

If the furnace keeps operating when it's in the 30s or 40s, you may want to have the system examined by a competent service technician. As always, the outdoor condensing unit should be kept clean and the furnace filter should be changed no less than monthly, unless you have an electronic air filter.

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1 Answer

HEAT PUMP OPERATION FOR TEMPSTAR SMART COMFORT 2400, MODEL THC436AKC1. LOWEST OUTSIDE TEMPERATURE FOR OPERATION?


I have installed many heat pumps and if it is installed without and ouside temperature sensor I would not recommend running it below freezing 32 degrees farenheheit. Running a heat pump at low outside ambient temps. can hurt your compressor and that is the most expensive part of the outside unit.

Dec 20, 2009 | Heating & Cooling

1 Answer

Till what outside temp is the 8Kw heating output


Are you referring a to an electric furnace providing the heat, the heat pump providing the heat, a heat pump providing heat usually with an auxillary/emergency electric heating unit, or an air conditioner with an electric furnace attached? If your system normally uses a heat pump for the heat normally, there is an eletric auxilliary heater. You'll probably need to turn it on at the thermostat manually when the outside temp gets below 40 degrees. If you have it nice system, it might do it automatically. If you're referring to the electric heater being rated 8 kw, it'll run using 8kw when you turn it on. It doesn't have the ability to change what heat rating it is. If you're refurring to the heat pump system being rated 8kw, you're probably mistaken. A heat pump might possibly consume 8kw to run the system but that can't be a measure of the system's capacity. Heat pump measurement units are rated in tons, but the system will always run at the same ton capacity whenever it's on, provided it doesn't need any maintenance. Some commercial air conditioning and heating systems have to ability to modify their power output based on the outside temperature, but I doubt you're dealing with that kind of thing.

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2 Answers

Hi- Can not tell if my unites are straight cool / heat or a heat pump.


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