Question about Ruud UBHC Air Conditioner

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I have a heat pump unit. the fan will not come on. on the outdoor

Heat comes on. but is not blow n inside

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  • Anonymous Feb 10, 2009

    My problem is similar, although I'm not sure that it is just the fan. I had someone come to check it and they said that the "defrost control board" was bad. They replaced it and the unit seemed to work for a short time, but now we are back to square one. If this thing burned up another control board, what should I do? Could it be something else?

  • RDrennan May 11, 2010

    We need a bit more diagnostics than simply the fan won't come on. I'm sorry. There are many things that can cause this. If the outside unit comes on but the indoor unit does not blow air than we can be assured that there is control voltage up to the thermostat and power to the indoor unit. So what we need to doo is verify if there is power, 24 volts getting fro "R" to "G" at the stat and then also at the indoor unit. If this is so then there only remains three possibilities, a bad fan control board, faulty wiring to the fan motor or a faulty fan motor. This is the diagnotics ahead of you.

    If you have any questions feel free to contact me directly...



    Richard (Rick) Drennan
    Global HVAC Distributors
    RUUD Field Support Representative / Instructor
    rdrennan@globalhvac.com
    900 Spreckels Ave
    Manteca, Ca. 95336
    Office (877)448-7263
    Cell (209)456-0513

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  • 8 Answers

Ck capacitor on blower motor,ck relay,also make sure you have signal from thermostat to indoor unit

Posted on Mar 19, 2009

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AlvinInside unit fan works; outside unit does not come on. Inside unit showed H5 code once. How do I proceed?


H is most likely for heat pump, meaning error 5 on outdoor unit. My guess would be low pressure since your power to the indoor unit most likely comes from the outdoor unit. Check manual for codes or research model number error codes.

Jun 03, 2016 | Fedders Air Conditioners

Tip

A Great Tip For Saving Money


While everyone usually remembers to change their AC and Heater filters, no one thinks about cleaning the heating or cooling outdoor coil. If you have an outdoor unit for heating or cooling, those coils need to be clean too!!

The principle of an HVAC unit is to remove heat or cold from your home to make sure you have a comfortable temperature inside.

If you have a gas furnace, your good to go in the winter. Make sure you change your filter every month and you should be able to keep your home at an nice temperature for you and your family. BUT, if you have an air conditioning unit hooked up to cool your house in the spring and summer, you need to do a little maintenance every spring to make sure you get the most out of your unit and save money. The same principle works for a heat pump, so i'll break it down for each unit.

1. An air conditioning unit that has a gas heater works just like it sounds. In the winter, your thermostat will tell the heater to turn on. You will have your burner running until the fan switch in the heat exchanger gets to the right temperature to turn the fan on. This is so you don't have cold air circulating through the house. Cooling on the other hand works a little different. If your thermostat calls for cooling, your fan will turn on right away and your condensing unit outside will turn on. What you AC is doing is removing heat inside the house and putting it somewhere else. That;s where your condensing unit comes in. The heat you removed inside the house is transferred outside where it is compressed and cooled through the use of the outdoor fan.

Now, imagine if this outdoor unit has dirty coil. You are no longer able to remove the heat from the house because it's not able to be removed because of a dirty coil. This means a huge loss in cooling capacity, higher running amperage on the compressor, and your electric bill being alot larger than it needs to be. I'll have the solution after I address the heat pump.

2. Now, the heat pump. It is basically an air conditioning unit that can reverse. In the summer, the outdoor unit will blow hot because of the heat it removed in the house. In the winter, the outdoor unit will be blowing cold because it is using the heat outdoors to add heat into your house. While this sounds weird, it's engineering at it's best. In the winter, heat is able to be removed from very low temperatures and your able to transfer heat into the house because you have a compressor in your unit. It does what it says. It takes a low pressure-low temperature refrigerant and compresses it into a high pressure-high temperature refrigerant.

Now, getting to the coils of both units. You need to clean the outdoor coil on both units every spring to make sure you have a clean coil. In the long run, this will allow the unit to expell the heat gained from the house and in the long run will add life to your compressor and save you money.

On the heat pump, you'll also need to clean the coil every fall. This is because if you don't, you could have a problem with freezing your outdoor coil. If you can't remove the heat from indoors, you will slowly turn your outdoor coil into an icemaker!!

So, based on what you have, turn the power off to your outdoor unit. Spray very good with a degreaser such as simple green and let it sit for about a half an hour. Then, grab your hose and wash out the coil. You'll be amazed what comes out. Let it sit for a coup0le hours to dry out, then turn the unit on.

This will not only extend the life of your compressor, it will also save you money in the long run!!

on May 11, 2010 | Air Conditioners

2 Answers

I have a Mitsubishi heat pump that runs well but the outdoor unit does not defrost what could be the problem.


Why does my heat pump ice up in Winter?
Heat pumps naturally ice-up in the winter. It is normal for the entire coil to be covered in a white frost and even light ice, during cold weather conditions. However, it is bad for the entire unit to be encased in ice. This indicates ductless heat pump problems which should be addressed quickly to save energy and avoid serious damage to your ductless unit. These systems should periodically go into a defrost cycle. This keeps the unit running efficiently. If the coils are blocked by ice, proper heat transfer between the coil and the outside air will not occur.
How does the defrost mode work?
When the mini split heat pump goes into defrost, the reversing valve inside of the outdoor unit is energized, switching the system from heat to the air conditioning mode. The outdoor coil becomes the hot, the indoor coil becomes cold, and both - the outdoor and indoor fans shut off. This allows the outdoor coil to melt accumulated ice. When the built-in micro-computer analyzes that all ice have been melted, the heat pump heating system goes back to heating mode.
sanyo-mini-split-defrost.pngA cloud of water vapor may be seen rising over the outdoor unit and a "whoosh" sound can be heard as the refrigerant reverses direction. The entire process usually takes up to 10 minutes (depending on conditions).
How often does the system goes into defrost mode?
Ductless mini-split heat pumps have different ways of determining when to go into defrost. The built-in microcomputer determines outdoor temperature, refrigerant pressures, and several other factors. In colder temperatures the system will go into defrost more often than in warmer.
If a ductless mini split heat pump is severely iced-up in the winter it is possible that it isn't defrosting (though there could be many other causes). Let the manufacturer certified technician check your system

Oct 29, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

2 Answers

My down stairs unit is blowing out warm air. the fan outside is blowing cool air....


Hi,
Your unit is running in heat pump mode...hope you knew that you had a heat pump...
Anyway the problem would either be the thermostat or the reversing valve...
It will take some detective work to figure out exactly which is causing your problems...

heatman101

Aug 16, 2010 | Ruud UBHC Air Conditioner

1 Answer

Indoor fan blowing cold air when on heating


The indoor fan will continue to run. When heat pump goes into defrost the outdoor fan stops, the reversing valve switches and the unit is basically working in the cooling mode. In order for you not to feel a blast of cold air in the winter the electric strip heat also comes on so the indoor fan must run while the strip heaters are on.

Jun 03, 2010 | Air Conditioners

1 Answer

I have a Panasonic CS/CU-W18DKR - on cooling it works fine, auto aswell as fan, but on heating when it is on manual fan control it used to blow all the time, but not for some reason it only blows...


When the unit heats inside, the outdoor unit cools, and if the outdoor cooling coil gets too cold the system turns off indoor fan, and changes gas flow direction to de-ice the outdoor coil. Ensure both coils, and the filters are clean and if there is still a problem check system gas pressure for leaks.

Apr 18, 2010 | Air Conditioners

1 Answer

Heat pump not running


check your house circuit breakers first that should be labeled heatpump or outdoor unit
make sure it is on and or not tripped
then if you have a box outside near the outdoor unit open it up and see if there is a breaker or maybe fuses that could be blown

May 26, 2009 | Goodman CPLE24-1 Air Conditioner

1 Answer

Vibration when heat only is on inside and out


Is it noisy always when running in heat or only for intermittant periods? Depending on where you live every 45-90 minutes of run time the heat pump goes into a cycle called defrost. The fan on the outdoor unit will shut off. the compressor will continue to run but in actually cool mode. this heats the outdoor coil and allows any frost or ice that is built up on the outdoor coil to melt. The compressor can get pretty loud in this mode and you may actually see steam coming off of the unit. This is normal. However if it is noisy all of time in heat check/clean your coils. If this doesn't remedy it have your refrigerant charge checked by a NATE certified Service Technician. Good luck.

Nov 22, 2008 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Our toshiba ras13 skv a heat pump keeps going to pre def mode and not heating the house


this happens when the outside temp is low, asthe outdoor unit blows cold when in heating (reverse) then the unit goes to pre def to avoid it freezing. You should hear a whoosh this is the heat being blasted to the outdoor unit to defrost it, then the heat has to build up again before the indoor unit fan runs up again and blows heat. Mine does the same every 20 mins or so (its -2 outside) brrrr
Leigh

Jun 18, 2008 | Air Conditioners

1 Answer

Amana heat/air conditioning pump


You are going to have to increase the amount of heat absorbed by the evaporator coil on the indoor section of your system. First change the filter. Second turn the power off to the outdoor section and leave the indoor fan running until all the ice on the evaporator coil has thawed this could take a few hours. Third you need to verify that you are getting adequate airflow across the indoor evaporator coil and the outdoor condenser coil both fans should be spinning at full speed and airflow should be unobstructed by dirty coil fins or debris Hopefully after you've done this you will have cold air blowing inside and the larger of the two lines entering the unit outside will be cool to the touch but not frozen or even frosted regardless of run time and the small one should be the slightly warm but not hot. If the larger line continues to freeze then it could indicate a number of problems but essentially your condensers cooling capacity is outrunning your evaporator coils ability to absorb heat from air stream circulating in your home.Hope it works out for you GL!

Jun 10, 2008 | Amana PTH123B25AJ Heat Pump Air...

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