Question about Carrier 38CKC036 Air Conditioner

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WE have a Lennox furnace that is 3 years old. We also have a Lennox AC that is 14 years old. Recently we had a board go bad on the furnace after a series of power outages and it was replaced. We also have had an Aprilaire Humidifier 600 installed since the new computer board. Since the weather has turned cooler and we have the thermostat set in heat mode we have noticed random attempts by the A/C unit outside to come on at which time there is serious draw down of our power in the house to the point the lights are dimming and we can here a loud buzzing at the A/C unit when it tries to run. We have had the company who installed all of this back out here and they did find some loose wiring but the problem persists. What could be causing this and how do we trouble shoot it to get it corrected?

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Your furnace uses 115 power & there is a transformer in this unit that powers the low voltage controls. i would say that when they replaced the board they missed some issues with the low voltage control wires. which is likely to be what cause the board to go bad. theses low voltage wires are the only thing that can tell the outside unit to come on. the lights dimming tells me that you have a bad capacitor or need a hard start kit. the lights normally only dim if the compressor doesnt start.

Posted on Oct 15, 2013

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Posted on Jan 02, 2017

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shastalaker7
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SOURCE: Anyone have the service/installation manual for

HI, THE 351 ON THE MODEL NUMBER SHOWS NOTHING. BUT THE REST IS CORRECT. IF THIS IS A HEAT PUMP, IT WILL HAVE MANY MORE CONTROL WIRES. IF YOU ARE BLOWING THE CONTROL FUSE YOU HAVE A DEAD SHORT. GO TO THE OUTDOOR UNIT AND WRITE DOWN THE COLOR AND AMOUNT OF WIRES COMING OUT OF THE UNIT, AND WHAT COLOR THEY ARE CONNECTED TO. THESE GO BACK TO THE INDOOR UNIT. RED IS ALWAYS YOUR HOT, Y IS FOR COOLING, G IS FOR FAN, AND W IS FOR HEATING. IF YOU HAVE ORANGE, BROWN, PURPLE BLACK AND SO ON COMING FROM THE OUTDOOR UNIT, YOU HAVE A HEAT PUMP. ON A SIMPLE CENTRAL UNIT, ONLY 2 WIRES TO THE OUTDOOR UNIT, RED AND WHITE. RED TO RED, WHITE TO Y ON THE INDOOR UNIT. LOOK AT THE SCHEMATIC ON THE INDOOR AND OUTDOOR UNIT, AND IT WILL SHOW YOU WHAT COLOR GOES WHERE, JUST LOOK AT THE LEGEND FOR THE LOW VOLTAGE CONNECTIONS AND THERMOSTAT, AND FOLLOW IT. YOU WILL NOT NEED ANY MANUAL. MAKE SURE YOUR RED WIRE IS NOT TOUCHING METAL ANYWHERE. KEEP ME POSTED ON THE OUT COME, WE WILL HAVE UP UP AND RUNNING. LET ME KNOW IF YOU HAVE A HEAT PUMP.
SHASTALAKER7
A/C AND HEATING CONTRACTOR

Posted on Mar 16, 2011

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