20 Most Recent Whirlwind FH-778 Air Conditioner - Page 2 Questions & Answers

There are many videos on youtube to help you. Try this one http://www.youtube.com/watch?v=b4BtZHrqHYQ

Whirlwind FH-778... | Answered on Oct 27, 2012

It sounds like the unit is stuck in the heat mode or the thermostat switch is still on heat. If the switch is in cool then you can go to the outside unit and locate the reversing valve. It may be stuck in the heat position. You can tap it with the handle of a screwdriver but only on the ends and very lightly because if you dent it the valve will be stuck for sure. If it shifts you will hear a loud hiss as the pressure equalizes. You could also try unplugging it from the circuit board. On some units it is energized in the cool mode and on others it is energized in the heat mode.

Whirlwind FH-778... | Answered on Sep 01, 2012

Condensing unit is not running check the circuit breaker , thermostat on cooling? is this a window unit if so compressor has problem

Whirlwind FH-778... | Answered on Jul 28, 2012

Here is where you can find all the info you will ever need about Mitsubishi Air Conditioning units...
Check out this tip that I wrote about that...

Mitsubishi Air Conditioner Troubleshooting and Repair


Whirlwind FH-778... | Answered on Jun 14, 2012

Hello, sounds like either low airflow or a low refrigerant charge. The air slows down because the evaporator coil on the inside turns into basically a block of ice and blocks airflow. I would first make sure air filter is clean, evaporator coil is clean and that the blower motor is clean and running at proper speed. If that checks out good then the unit has a low charge.

Whirlwind FH-778... | Answered on Jun 06, 2012


PDF File

Whirlwind FH-778... | Answered on May 24, 2012

Listen the easiest way is to add freon on the low side until the line starts sweating. This is the quickest way to do it. The other way you have to know your wet bulb temp on the low side line the outside temp the inside temp at the intake and the ambient temp outside this is complicated and works no better than the sweat method i described.

Whirlwind FH-778... | Answered on Jan 14, 2012

help i have the same problem did you find a solution as i have tried every where for a remote its annoying.

Whirlwind FH-778... | Answered on Oct 31, 2011

It all depends up on whats the brand and model number on the commercial AC system.Some are high capacity and some are low capacity, commercial AC system.--------- If the less refrigerant will be added then it will not cool properly, if over refrigerant is added then it will spoil the compressor .So all depends up on its exact model and brand.--------- Basically all the details should be mentioned on the AC system.There is a sticker on its left or right or front or back.On that all details should be mentioned.--------------- ----------------- This is example of what it writes on the sticker.--------- HCFC-22 3lbs. 14oz. or 1.76 kg ------------ Mostly its written in this type.-------This means that this system uses R22 Freon (HydroChloroFluoroCarbon) and this unit takes three pounds and 14 ounces of Freon or its equivalent weight of 1.76 kilograms. --------- So you have to just locate the sticker on the AC system.And this will help, you to confirm, how much refrigerant it actually takes. --------- This will help.Thanks.Helpmech.

Whirlwind FH-778... | Answered on Sep 09, 2011

Might of switched the wires if it was working before you changed the thermostat

Whirlwind FH-778... | Answered on Sep 01, 2011

You need to check the inside fan. Check the inside unit (where you change the filter), Open the panels and turn on the A/C Look for a panel switch located on the frame where you removed the panel and if there is a switch press it in. Listen for your fan to be turning, any scraping, scratching, means worn bearings, slow turning means bad relay, or capacitor. Hope this helps Fixya up.

Whirlwind FH-778... | Answered on Aug 13, 2011

First off, Freon is no longer approve and has been banded by the EPA R134a refrigerant is what is now approved. You will also need to have the proper gauges and pressure lines to attach to the compressor, to delivery the refrigerant gas. But, before you can do that, you must purge and capture any of the remaining Freon gas left in the compressor. The 2 different type of refrigerant gases shouldn't be mixed. Capturing the Freon requires a purging pump and tank.

After reading the above, if you still want to do it yourself, go by your local auto repair store and purchase all the equipment (Gauges and hoses set up for testing the high and low sides of the compressor) you'll need,. It usually comes as a kit for a little less than $100.00. Plus, 3 cans of R134a refrigerant. You'll probably only need 2, but having an extra one is safer. When you get back home, use the Owner's Manual for the AC unit, to determine what the pressure should be on the high and low sides of the compressor, as well as the where the refrigerant ports on the compressor are.

I hope all this helped you and thanks for choosing FixYa.

Whirlwind FH-778... | Answered on Aug 06, 2011

Is the compressor starting? On the outdoor unit you will see a large copper pipe and a small copper pipe. Is the larger of the two cold to the touch? wet? Just because a central air system is not blowing cool air does not mean it needs freon. If you have clogged filters it cannot do an air exchange. So, I would recommend checking the easiest things first before adding Freon.Most people make the mistake of adding Freon and overcharge their system. In a low load situation you can slug the compressor with liquid and your system is ruined. If you do have to add Freon it indicates that you have a leak. An AC System is a closed system and if it is working properly you should not have to add Freon.

Whirlwind FH-778... | Answered on Aug 03, 2011

You need Guages and a meter

Whirlwind FH-778... | Answered on Jul 19, 2011

There are several things you can try .If you don't have shade then try putting aluminum foil on the inside of the widow and scotch tape it in place. Leave curtains shut and leave the blankets up if you want. The foil will help reflect the heat build up through the glass.If possible if you have storm windows on then place the foil on the glass closest to the outside. This will help more by not letting ultra violet rays into your house which get trap and cause heat build up. Clean or replace air filter and squirrel cage on blower to make it move more air. You can also make sure all vents are clean and vacumn out as much of your duct work as you can reach. On the outside unit if you have a lot of grass or weeds growing around the condenser unit then cut or pull them to provide good air flow. Shut main power off to outside and use garden hose with a pressure nozzle on it and wash all the fins and coils you can. It's just a rule of thumb but you can feel the copper lines to the condenser while the unit is running. the large line should be cool to cold and have condensation on it while the small line should be much warmer. If they are not you may need to have a service tech. check the pressures and add if needed. Best of luck.It's 108 here today so I sure hope any of this helps you. Thank you.

Whirlwind FH-778... | Answered on Jul 16, 2011

Have the unit tested for proper refrigerant level and have the unit checked for any mechanical issue that would prevent the compressor from turning on

Whirlwind FH-778... | Answered on Jul 01, 2011

It should have a tiny rubber hose that you drain Water from the unit into a bucket

Whirlwind FH-778... | Answered on Jun 29, 2011

Compressors can fail at any time, how old is the unit? You should get at least ten years from a factory installed compressor, Be `sure to get a filter dryer installed on the new one

Whirlwind FH-778... | Answered on Jun 22, 2011

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

224 questions posted

Ask a Question

Usually answered in minutes!

Top Whirlwind Heating & Cooling Experts

Dennis Boxerman

Level 3 Expert

1305 Answers


Level 3 Expert

747 Answers

Paul Carew

Level 3 Expert

3527 Answers

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

Answer questions

Manuals & User Guides

View Most Popular

Whirlwind Heating & Cooling

  • Whirlwind Heating & Cooling

Most Popular Question

heavy exhaust smell from c

  • Heating & Cooling