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The unit is not going into heat mode at all.

My inverter is not going into heat mode, the vents open and a very slight breeze of cold air comes out.

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Hi there , ok depending on the brand and model please make sure that the control is in heat mode, secondly that the remote has fresh batteries,(if it is remote ) once you have established this try the following. 1. turn the system on in full cool first .  If it is cooling , wet the back of your hand and place it near the fan out let , you should be able to feel the coolness enough that it feels like its biting your hand , if this happens good , it means that the refrigerant charge is good and its not a gas problem , if it feels kind of weak then refrigerant is the problem and you will need a qualified person to test the system, ok if it was good then switch is over to full heat , remember to wait about five minutes because most of these systems are fitted with a timer to protect the compressor from sudden off/on switching so be patient ok once it starts and fan is running feel the air comming out , also go outside and see if the fan is running or not and if you can hear like a motor running or not as well this will indicate if the compressor is working , now in the heating mode you should be able to feel the air comming out of the out door unit from the fan it should be cold, if it is hot and you have the system in heating mode then the reversing valve or solenoid is the problem and you will require a technician to repair this because of the nature of this problem, some times these system have problems in heating especially if it is running on freon 22 as this gas will not operate below 5 deg C. if it running on freon 410a then it can run as low as -5 deg C  Something else to consider is the out side temperature  is it too cold ?  see how go , i hope this information helps you , remember if the control is remote and the batteries are even half flat it will send a garbled message to the system and it won't know what to do so make sure to change the batteries.
Thank you and have a lovely day :)

Posted on May 12, 2009

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2 Answers

What diverts air to defrost. Air comes out vents and floor. ac works and heat , but won't go up to dash vents. The flaps are working.


You just THINK the flaps are working, but apparently the top vent is not. These multiple flaps are controlled by vacuum and you have a line off to that particular flap. This means the flap won't open and the vacuum leak, whether you can hear it or not, is making you lose MPG also, though slight. The vacuum line could be cracked or disconnected from the flap or at the vacuum block on the back of the lever unit.

Aug 18, 2014 | Cars & Trucks

Tip

Why your unit is freezing up.


To understand why your AC or heat pump is freezing up, it helps to know how your system works.

There are 7 major parts to an AC system, 9 with a heat pump.

1 - Condenser/heat pump (The outdoor unit)
2 - Air Handler (the indoor unit unless the system is a package unit, then all is outside in one system. The air handler is usually found under the home, in an attic, or in a closet.)

In the condenser are the following major parts.

3 - Compressor
4 - Condenser coil
5 - Condenser fan
6 - (HPs only) reversing valve

In the air handler are the following major parts.

7 - Blower motor
8 - Evaporator coil
9 - (HPs only) electric heat strips

Some systems known as "dual fuel systems" use another heat source in place of the heat strips, usually a gas furnace. I will address gas furnaces in another post.

When an air conditioner is operating properly several things are taking place.

1 - The compressor is compressing or "pumping" refrigerant through the system.

2 - through changes in pressure, the refrigerant makes the evaporator coil get very cold, and the condenser coil gets very hot.

3 - The blower motor/fan circulates air across the evaporator coils, as the room temperature air (Also known as "indoor ambient") goes through the cold coil, it exits, cooled approximately 15 to 20 degrees cooler than when it entered. (In a ducted system, the blower is also the fan that circulates the air throughout the home.)

4 - The condenser fan circulates air across the condenser coils. As the outdoor air goes through the condenser coil, it removes heat from the coils that are very hot. This in turn removes heat from the refrigerant so it can run its cycle again, and through pressure changes, cool the evap coil.

5 - With a heat pump, the reversing valve reverses the flow of refrigerant in the condenser and evaporator coils.
In AC mode, the evaporator coils get cold, and the condenser coils get hot. But in heat mode, the evaporator gets very hot, and the condenser very cold.

Now, whichever coil is getting cold will freeze up if there is inadequate air flow across the coil, as the refrigerant in it is far below freezing, and there is not enough airflow to keep the humidity in the air from freezing on the coil.

Things that can cause poor airflow are,

1 - Dirty/clogged coils
2 - dirty/clogged filter (will only effect evaporator coil)
3 - Closed/blocked vents (will only effect evaporator coil)
4 - Malfunctioning or dirty fan

Low refrigerant will also cause a coil to freeze up, reduce efficiency and cause the system to run for long periods of time. Not to mention, shortening the life of the unit.

With a heat pump, in heat mode only, the condenser (outdoor) coil will routinely begin to freeze up in cold temperatures. This is due to the fact that the refrigerant is below freezing, and the cold outdoor ambient temp is not warm enough to keep the condensation in the air from freezing on the coil.

Note, a properly working AC should never freeze up.

A heat pump is equipped with defrost controls to prevent ice buildup.
Some are controlled by timers, some by temp.

When a HP is going into defrost mode, the condenser fan shuts down, the reversing valve reverses the flow of refrigerant and the once cold condenser coil now gets very hot, defrosting the coil. (Many people have said this process sounds like the unit is coming apart, or about to explode and are frightened by the "smoke" which is really just steam from melting ice that comes off the unit.)

During defrost mode, the secondary or "auxiliary" heat comes on to ensure that you are still getting warm air from the vents. (Again, this can be electric heat strips or a dual fuel system)

If you are experiencing cold air from the vents during defrost, that means your auxiliary heat is malfunctioning.

The auxiliary heat is used for three purposes.

1 - during defrost mode to maintain warm airflow (automatic)
2 - when the HP cannot maintain the set temp due to extreme outdoor temps. It comes on when the indoor temp drops several degrees below the set temp on the thermostat (automatic)
3 - For emergency heat source when the HP is not working. (Manual)

To recap....

Iced up coils?

Poor airflow
low refrigerant
Malfunctioning fan
failing defrost system


There are two things that can be done in a pinch to help de-ice frozen coils. This may get you by until the repairman can get there, or you can fix the system if you are a do-it-yourselfer.

HPs frozen outdoor coil in heat mode, not going into defrost?

Cover most of the vents, and turn the system onto cooling mode until the outdoor coil is thawed. then uncover vents and return to heat, or emergency heat. (this usually takes 15 min or less)

Frozen coils in AC mode with a heat pump?
Turn the system to heat with the thermostat on just high enough to get the system to come on. (again, usually takes 15 min or less to thaw.)

AC only, with frozen evap coils? (this can sometimes be seen frozen all the way outside to the compressor on the copper lines.)

Turn the system off, and the fan switch from "auto" to on".
This will usually defrost the coils within 1 to 2 hours.
(If your system has the furnace in line before the evap coil, turn the system to heat, and the furnace will defrost the coil within minutes.)



on Dec 25, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Ac exhaust fan


Yes for dehumidifier, no for heat mode. In dehumidifier mode all the unit does is takes air in, runs it through the evaporator (cold) coil and the back through the condenser (warm) coil discharging dry, slightly warmer air back into the room. In heating mode however if you don't vent the exhaust there will be no heat produced. Warm air will come out the top but cold air will also come out the exhaust (essentially, in heating mode all it does is operates as an air conditioner in reverse. Hope this helps.

Jan 11, 2014 | Whirlpool ACP102PS Portable Air...

1 Answer

Plymoth breeze vents blow cold air when ive been driving it and its on heat


There is a blend door on the heating box that is called a plenum. That plenum is behind the glove box. There are levers that attach to it on the outside and those control the blend door. Those levers can be run from vacuum or electric or even cables. Check to see if the move when you change the heat setting from hot to cold. But be aware that there is also a mode lever that changes where the air comes out so dont get them confused.

Dec 30, 2013 | 1998 Plymouth Breeze

1 Answer

With the unit on heat the front vents blow heat but the rear vents only blow cold air


are you talking about the overhead vents? They only recirculate air without the a/c on.

Dec 12, 2013 | 2002 Dodge Durango

1 Answer

What's going on -- Vents are blowing hot air and


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.

Jun 05, 2010 | Whirlwind FH-778 Air Conditioner

1 Answer

Fujitsu inverter; opens vents but no red light, no cold air


check that it is set to cooling sounds like it may be set to heat in cooling mode the indoor fan should at least run

Mar 10, 2010 | Heating & Cooling

1 Answer

Heating unit is blowing cold air...


HEY< this sounds like an electric furnace and some heating elements are not working! WHY! Just call 918-6878813 and see if KOOL BREEZES cAN HELP!

Dec 13, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Heated air coming out when unit is in Cool Mode


Heat pumps are sometime constructed to "Fail in the heat mode." It could be either the t'stat or the reversing valve. Be sure the t'stat is wired correctly. Usually the"O" terminal is for the reversing valve on the outdoor unit.

Mar 28, 2009 | Heating & Cooling

1 Answer

Heater not working


I would check if your vent to the outside is open. If it is I would check the vacum hose that controls the vent to open and close.

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