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I have a ten year old carrier heat pump unit. I recently replaced the indoor tstat. the outside contact and the transformer. Had a tech put freon in the unit also. I have to problems one is the airflow is minimal coming out of the vents it has new air filter and I cleaned the inside and outside unit coils. And the second problem is the ac with not get cold.

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Two things are the most likely culprit. First check ytour inside coil with the unit running for 10 minutes or more and see if the coil is sweating there should be water running off of it. Also after one hour is there ice forming on it. These problems are lack of air flow which is caused by restricted air flow caused by a dirty filter dirty coil (which you have already taken care of) or your blower motor may not be kicking into high speed. Your motor will start and then after it gets to a certain speed it switches to a high speed. After running only 15 minutes if your blower motor is hot to the touch. Be careful some will cook an egg. If it is hot not just warm it is bad and needs to be replaced. Also if the fan is not running properly you can not get reliable readings with your gauges when adding freon. So if this is the problem then you may have to have the units freon cked again. If the line is not sweating at the outside unit where it goes into the unit the freon pressure is not right. The larger copper line will be cold and sweating the small line will be hot to the touch when the system is balanced and running properly. I hope this helps

Posted on Aug 23, 2010

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Need a bit more info. Do you hear the compressor come on? Is your Tstat in the cooling mode? Shut it down for a minute and turn it back on. you should hear the indoor fan come on . outside fan come on and the compressor come on the sametime as the out door fan comes on.. Freon is just a gas that is used to exchange heat .

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YOUR the first person that has gave enough information to help in a WHILE THANK YOU SO MUCH!!

Start all over from first
I'm betting that you need a fuse in both sides of the transformer until you find the real reason they burn up.

A solenoid valve that sticks can cause the transformer to blow but so can a lot of other things, namely anything in the control circuit that uses the 24V power. A relay or contactor that doesn't pull in or a defective defrost control, a shorted wire from the thermostat.

I'm wondering if you have what we call a package heat pump meaning the both the indoor blower and out door compressor & fan are in the same section out side? OR is your a split system with an indoor section and an outdoor section?

I'm betting on the split section. In some miss-matched systems (like a Lennox indoor and a GMC out door for example) Some of the origonal Lennox heat pumps had an out door and an indoor transformer. If these trans formers were not "phased" together it could cause a problem like your having. Now you just have it in the heatign mode if I read between the lines correctly. So it makes snece that it's something with the heat. The out door unit can opperate withits own 24v but if you have back up heat inside (gas or electric Im thinking you have electric) the indoor section will come on atfter a few more degrees of heat loss (2-4'F). This is where the transformer inside will buck the one outside and somethjing has to give. The weakest point.

From what ive been told by some of the old hands I've been around if the high volt side burns out look for a low volt problem if the low volt burns out look for a line volt problem.

If this has 2 transformers like I suspect try the fuse on both sides but remember the one is hot and will remain hot all time on 220V or 1 leg of it or it might remind you. To phase these transfoprmers I believe you swtich the main lines L1 & L2 at either of the transformers. Now 1 more thing the indoor section may be using ground on the low volt side as a path for 1 side of the transformer. I believe you will ahve to do same for the other transformer too.

Hope this helps Id really like to know what you find and do.
Please ask more and you give such detail I can follow you with little trouble. Please rate me as high as you can and good luck.

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