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Hi,I am really hoping to find someone to help me if possible. I have a one year old carrier infinity 4ton 17seer condenser and a 5ton variable speed air handler. I has worked fine but now i am getting a SYSTEM MALFUNCTION on the thermistat. When this message appears the air handler continues to blow and only the fan on the condenser continues to run but NOT the compressor so it is not cooling. At times it begins cooling again but then later stops cooling and shows the same malfunstion message. I have called out carrier tech and they have no clue so far. They have checked the contactors also and they look good. The error code is 73 on the air handler and the condenser error lights. The error in the menu of the thermistat read: contactors shorted and compressor voltage standby. Is this a mystery? Thanks.

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If this si what I am thinking it is, it will be very hard to find and prove....
The compressor windings have aflat spot and if the motor stops at the right place it will not atart. The voltage goes way up and kicks out the thermal over load and gives you the alarms that you are getting.
The motor cools down and you reset the unit, the motor has moved just a tick trying to start the last time so now it is off of the bad start spot and will take off and run till it stops at the bad spot again....
Did that make any sense???
Long story short your compressor is going bad...problem will be to get it changed under waranty and convincing the installing company that you have a problem that requires a compressor replacement...
See if you can get them on a short leash and have them come before you reset the alarms and hopefully maybe they can catch what it is doing...
This is and will be a tough one... I've been there with a customer or two already... no fun... trying to figure things like this out!

I hope that this will help you to solve your problem!

Thanks for using Fixya!!


Posted on Dec 11, 2009


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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if your air handler and ductwork are sweating, this tells me that the unit is operating too cold. The slower the airflow, the colder the temp. Your infinity unit is a wonderful machine! But I've seen many of these units that horizontal leak water due to airflow issues. The air handler(inside unit) has a true "variable speed" blower motor. Where we used to have low, med., high speed, now an 1100 rpm motor will have 1100 speeds(so to speak). Now after installation, the company should have sent the technician to set the system up by checking a TESP, total external static pressure. This info is located on the air handlers info on the front of the unit(sticker on panel). This verifies that the airflow is adequate and proper for your house and ductwork. If this is not right then blower motor damage may occur. Also, if you can imagine a cold can sitting on the table. If the temp in the air is warm and moist the cold can is cooler that the air it is sitting in. The can will sweat and a puddle will form on your table. Now, your air handler is running too cold, probably due to low air flow. Its sitting in a warm(er) moist environment, and sweats. It's all insulated but this won't matter due to infiltration of warm air through the insulation. Most people don't understand why too cold is a problem in cooling but this is one problem we have. And also, this unit may be leaking water from the condensate pan. I've had issues with this style. If it's not draining properly, the pan holds water and that water is pushed out of the pan by the blower. If the unit is not level, or down hill just a bit, towards the drain outlet, it will hold more water in the pan than its designed to hold. It also has a zoned damper? These zoned contrlloer/damper control modules can be installed anywhere, not just a closet. It would help if it's in a controlled environment, but not necessary if the machine is set up properly. I'm 99% certain you have an airflow issue! Get a second, third, fourth opinion. It may/will take more than 1 trip to fix this. Carrier corp. has dealers that sell/install Carrier machines. These companies have experience (ask them up front) with the infinity. And also have Carrier tech support. Ask for a TESP check before you schedule a service call. And any qualified tech won't mind explaining this process as you look over their shoulder as the work. You'll also been to get the duct reinsulated. I would contact your installer and ask them to rectify this issue, at their cost. Your contract with them should state a warranty, and also a "time subject for repair" if problems arise. If you are not satisfied with their answer, call your local/state license authorities. City inspection may/should work if you're inside city limits. Carrier also has field techs! But cost about twice as much as you're used to. Hope this helps!

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Our setup has the drain located with easy access and the initial pipe is open and centered over a larger fitting so the condensate can drip freely into it.

Good luck-

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