I have a new Carrier super high effeciency furnace, AC and PLC digital thermostat. New under warrenty.
The CD motor drive starts cycling the motor 150 to 300 rpm in 2 to 3 second intervals until I turn off power and reset system. It will run anywhere from 1 hors to 3 months with no problems and then start doiong this again.
AC cond 38TZA042331
Infinity digital thermostat software version CESR131339-05
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Re: Carrier Infinity DC motor drive problems
Contact the company that installed the unit. Its new, under warranty, Anything you do could void the warranty. If they do not take care of the problem without charges contact Carrier and tell them what's going on. The company who installed the unit is responsible for making it run correctly. Good luck.
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A million possibilities. You need a volt meter set to A/C volts. Find the circuit board where all of the thermostat wires connect. Place 1 lead from the meter to "C" and the other to "W" (make sure that the door safety switch is pushed in and the thermostat is set to call for heat) If you do get 24-30 volts then the thermostat is doing its job and the trouble is inside the furnace.If not, check "R" & "C" to see if the furnace transformer is sending 24-30 volts to the thermostat.
There has to be a mechanical thermostat and it is sticking or other wise defective. I don't think that the control board is defective because it finally does turn the fan on. However the mechanical thermostat is there to prevent the fire box temperature from getting too high before the fan starts, but there must also be a over heat thermo disc that will shut the fire off when the fire box gets too high.
Problem #1:Outdoor condensing fan motor has stopped running. This problem
could be caused by a bad motor run capacitor. If
your motor capacitor is not the problem, then more than likely you need a new
motor. Is the fan blade tight, stiff or hard to turn? If the fan blade is hard
to turn then you probably need a new motor.
Problem #2: Air conditioner compressor will not start. When power is applied
to the air conditioning outdoor unit the fan starts, but you hear a sound like
the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then
all you hear is the outdoor condenser fan run. The compressor is locked and will
not start. What is happening is the compressor is trying to start, but because
the compressor motor is locked it tries to start for a few seconds and then
because of the high amperage being drawn goes off on internal overload. The
internal overload protects the compressor windings from overheating and burning
up. I see this many times during the start of the air conditioning season. Some
compressors just have a hard time starting after sitting all winter long. Some
compressors are locked up so bad that I can not start them and must tell my
customer that they need a new compressor . Many
times I can get the compressor started again without having to buy a new
compressor or new air conditioning system by using the device that is called, "Super-Boost." I keep two or three of these on the truck. They
have saved many of my customers from having to buy new air conditioning systems.
Is this a gas furnace if so is it high efficient if so is there an led light on the furnace blinking a code usually seen through a window at the furnace. is the thermostat battery operated if so is it a new battery and are the aif filters new. These would be my first steps to check hope this helps
YOU COULD EITHER HAVE A THERMOSTAT PROBLEM OR FAN CONTROL PROBLEM.TURN THE POWER OFF AT THE FURNACE AND TAKE THE THERMOSTAT OFF THE WALL.MAKE SURE YOU MARK THE WIRES SO YOU KNOW HOW TO HOOK IT BACK UP AGAIN.RESTORE POWER TO THE FURNACE.TOUCH THE WIRES THAT WERE HOOKED TO THE R & G TERMINALS ON THE T-STAT TOGETHER AND HOLD THEM THERE.OBSERVE THE OPERATION. WHEN YOU TAKE THEM APART DOES THE BLOWER STOP?TRY IT A FEW TIMES. IF IT CONTINUES TO START AND STOP YOU GOT A BAD T-STAT.JEFF
Your old stat is wired for a traditional thermostat and not a communication stat like the new infinity you have. There is a module plug on the furnace board that will need to be connected to the new thermostat for it to work. The wires that are wired now are from a terminal strip inside the furnace. Please contact your local Carrier dealer. They may be able to get that harness for you
The clicking noise is a relay or switch of some sort. You are right about that. I have 2 questions. 1) does the thermostat have a mercury bulb in it? 2) when the fan shuts off and on, does the burner stay on?