Carrier Infinity System - System Malfunction Call Technician


  #1  
Old 09-29-14, 02:54 PM
J
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Carrier Infinity System - System Malfunction Call Technician

My thermostat for my carrier infinity system is displaying "System Malfunction Call Technician". I held the side button for 3 seconds to see what the code was.

It displayed:

76 - Low Stage Repeat
No Start
255 Events Active

I just bought this house. The previous homeowners had a technician come to the house because this problem was mentioned in the home inspection. I have the paperwork from the technician who came to the house. I says he cleaned the coils, cleared the drain, removed dirt from filter grill.

However, the thermostat keeps displaying this message every 24 hours. Any ideas what I should do?
 
  #2  
Old 09-29-14, 03:37 PM
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http://dms.hvacpartners.com/docs/100.../24ana-6si.pdf

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Compressor Voltage Sensing
The control board input terminals labeled VS, VR and L2 on
24ANA7 models and VS and L2 on 24ANA1 models (see Fig. 6)
are used to detect compressor voltage status, and alert the user of
potential problems. The control continuously monitors the high
voltage on the run capacitor of the compressor motor. Voltage
should be present any time the compressor contactor is energized,
and voltage should not be present when the contactor is
de--energized.

Do your contactors appear black and pitted?
A lizard tail sticking out of a contactor would also be a sign of trouble.

I'd also measure all capacitors in the outdoor unit.
 

Last edited by Houston204; 09-29-14 at 03:59 PM.
  #3  
Old 09-30-14, 06:49 AM
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Where are the contactors??
 
  #4  
Old 09-30-14, 08:34 AM
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The contactor is actually a relay and is located in the compressor/condenser (outside) unit. When the thermostat calls for cooling, it sends a 24VAC control signal to the contactor, which then closes (relay contacts close) and sends the 240VAC to the compressor and condenser fan. If the contacts are burned, even though they close, they may not make good enough electrical contact to enable the compressor and fan to turn on.
 
 

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