Question about Heating & Cooling

1 Answer

Control malfnction what's the cause when the unit cools then shuts off after 5mins. if the coil fins are clean and pressure is 60psi.?

Posted by on

  • Anonymous Jul 16, 2008

    Every 5-10 mins the unit shakes and rattles, then restarts and works fine for 5-10 mins. Its getting enough power, filters are clean, and its only a few months old - model is Amcor nanomax mf8000e.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 241 Answers

Check your room air and coil thermistor resistance it may be out of range or defective, if still good the control itself has defect.

Posted on Mar 20, 2008


1 Suggested Answer

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Air unit is freezing over

Check air filter, see if fan is running, check condenser coil for dirt build up. If its dirty shut power off and take top off unit so you can spray it with a garden hose. Use an up and down motion to clean the coil. Don't use too much pressure or you will damage the fins. If that doesn't work it may need charged.

May 11, 2014 | Intertherm Heating Cooling System 15kw...


Cleaning Air Conditioner Condenser Coil with Pictures

The most important Air Conditioning maintenance that needs to be done every year is the cleaning of the condenser coil. Doing the job of cleaning the A/C coil is the best way to make sure that your air conditioning system is working efficiently and giving you the best performance possible.

The tools needed to do the air conditioner condenser coil cleaning will be:

Garden hose with nozzle
Garden pump sprayer
Condenser coil cleaner (can be purchased at HVAC Supply houses, or many hardware type stores)
Hand tools needed to remove condenser fan

To do the job correctly you will need to first turn off the power to the unit and remove the condenser fan.


Once the condenser fan is removed then, you should wet down the condenser fins with a garden hose. Use nozzle that will give you a high volume spray but not with high pressure. Too much pressure will bend the fragile fins and cause them to shut off the ability of the air to flow through them, this is want you want to avoid. You want it to be as easy as possible for the air to get through the fins, for the best possible heat exchange.

After wetting the fins, you then will need to spray the fins inside and out with a foaming coil cleaner. Make sure to wear eye protection and hand protection. If you have sensitive skin, you may also want to wear long sleeves to protect exposed skin. I buy it in a concentrated formula then dilute it with water to the proper working formula. You may need to go over the fins a couple of times with the coil cleaner to get it worked into the fins. Allow the coil cleaner time to work the dirt loose and boil it out of the fins.



After about fifteen minutes start to rinse the coils with fresh water. This will take a long time and lots of water to fully rinse the coil cleaner from the fins. It also is very important that you get everything rinsed fully. Failure to do this will result in excessive dirt accumulation and also can cause corrosion. Make sure that the water is running clear and that all bubbles are gone before stopping your rinse.

Then reassemble the condenser fan, turn on the power, and check the operation of the unit. It is okay to run the unit immediately after washing it. The water will not hurt the unit.


You now will have an Air Conditioning unit that will give you the best possible performance!

on May 15, 2011 | Heating & Cooling

1 Answer

With the unit on cooling, it does not blow very cold air.

It sounds like you have a high pressure event shutting down the out door unit. Several things can cause this, but normally it is a airflow problem with the outdoor unit coil, either the outdoor fan is not running or the coil is getting plugged up with dirt in the fins which would need washed out with water, and if someone has overcharged the unit with freon it to will cause a high pressure safety event.

Oct 22, 2011 | Soleus KFIHP09 Air Conditioner

1 Answer

Can low air flow across the evaporator coil cause the high pressure cutout to trip on a heat pump during the summer? If so, how.

No, Just the opposite will happen. If you have low air flow across the Evap. this will cause the refrigerant to "puddle" or become dormant. Causing low head due to evap. frosting or coil freeze up. With low air flow your system is not transferring heat to the refrigerant in the evap. coil, so it (the evap coil) just gets colder and colder, lowering the pressures. Here are things which cause Hi head pressure, dirty condenser coil, low air flow across the condenser coil, air in the system, bent or kinked tubing before the evap. coil. Crushed fins (causing restricted air flow) in the condenser coil. With low air flow across the condenser coil, you can not "cool" the refrigerant, in other words get the heat out, it stays in the refrig. and kind of cooks the system. If your system is shutting off due to hi head, get a water hose and clean your outside coil first. Pull the power cut off, should be right there at the outside unit. turn it off at the t-stat. pull the power at the unit. Wash the condenser coil good. Do not use a press. washer as they can bend the coil fins making things worse. Use a bit of soap in a bucket, fill that with water and splash into the coils let that sit and hose it out. It is best if you can work from inside out (opposite of air flow across the coil, backwashing) but you have to remove the fan shroud to do so. If after you wash the coil, you still have a hi press issue you will need to do more troubleshooting. Hope this helps Fix Ya up.

Jul 09, 2011 | Heating & Cooling

2 Answers

Our air conditioner isn't cooling as much as it was, what could be the problem?

Hello, there are a few thing that can cause a Air conditioner to not cool well enough. First off the airflow should be checked, filters, evap coil to see if they are clean. Secondly the unit may have a leak which is causing your unit to loose refrigerant and therefore not cool well. Have these two areas checked out on your air conditioner.

Feb 04, 2011 | Intertherm Heating & Cooling

1 Answer

My Kenmore 73069's inside fins often freeze up. I don't have it set very low: 75 degrees F. Why does this happen?

Your setting of 75F doesn't affect the freezing because it is a result of the boiling point of the refrigerant in the a/c unit. The lower the refrigerant pressure is, the lower the boiling point is and the refrigerant cools the coil to that temperature also known as saturation temperature. The 75F is what it lets the room air get cooled to before it shuts off. The freezing can also be caused by low air flow across the coil which can be caused by dirty air filters, dirty fan, dirty coil or fan not running/not running fast enough. So check your filters and the coil to make sure they are clean. Make sure the evaporator fan is running. Then you may need to get the refrigerant charge checked.

Jun 15, 2010 | Kenmore 73069 Air Conditioner

1 Answer

My split type airconditioning unit is not consistent with its cooling system..its automatically shutting down its coolness..what to do?

Hi, make sure you have a clean filter. Wash the outdoor units condenser coil, as they will get dirty and cause it to shut off on high head pressure. Turn off the power first. Careful not to use to much water pressure as you don't want to bend the fins. These are things you can do. Other than that, it takes a qualified tech to go any further. Check these things and keep me posted. The temperature between the return air at the filter and supply air temperature is between 18 to 25 degrees F. This is called your T.D.or temperature split. Keep me posted on what you find.

Jun 09, 2010 | Heating & Cooling

1 Answer

Ilet the filter on my unit get clogged and it quit cooling. after i cleaned the filter it still doesn't cool.

"If your dirty filter caused your problem,' it was because it restricted the air flow across the cooling coil. Often if the filter is clogged then the air will divert around the filter itself - and clog the cooling coil too, in which case you will need to clean the cooling coil.

The cooling coil is looped in a coil (hence the name) and is comparable to a car radiator. You will need to clean the fins (that are entwined around the coil) so that air - can flow unrestricted, over the coil.

This can usually be accomplished with a brush of some sort. Often you can use your fingers to peel the moist mat of hair and dirt off the front of the coil.

The problem (usually) is getting to the coil, because once you get to it - it generally is not that hard to clean. Your goal is make sure air flows thru the fins and over the coil - unrestricted of dirt, hair, or whatever.

Remember - many things can cause an AC unit to 'not cool' besides the filter being dirty - which is why I prefaced my answer with 'if your dirty filter caused your problem'

Good Luck!

May 02, 2010 | Dometic Rooftop RV Air Conditioner

4 Answers

How to Clean 1984 TRANE Cooling VENTS inside house No Manuals

The Outdoor unit will be easy 1st diconeect power at panel, or disconnect box near unit. Remove top of unit, be careful not to damage fan blades. Spray coils (fins) with a light degreaser let is soak for 5 mins. wash out coils from inside the unit out. Spray straight on so you push the dirt out the other side.

Re assemble and start up.

Indoor coil will be accessed by removing front cover and you may have another cover to expose the inside of the coil fins. That is where you need to clean. Spray degreaser on coils and rinse off. If its gunked up then use a wire brush 1st. Carefull not to bend the fins over.

Check the drain pan at bottom of the coil to be sure it's not full of stuff. Blow out if needed.

You should be clean and ready for the season

Jul 02, 2009 | Ruud Central System Air Conditioner

1 Answer

P-tac unit shutting off

Start the unit and check unit data ( suction pressure, discharge pressure, current reading voltage reading, check if no icing at compressor suction pipe and evaporator coil) if everything is normal. check the fallowing.
- check for out of range pressure switches. By pass pressure switches and start the unit if the unit continue to run check which of the pressure switch is open while the unit is running.
- check for defective timer and magnetic contactor or control rely.
- if the unit installed with freeze up sensor then check it also.
- Or the control by itself.

Nov 09, 2007 | Kenwood KW85 Air Conditioner

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

56 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

3455 Answers

Donni Steen

Level 3 Expert

687 Answers


Level 3 Expert

85178 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides