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Old 08-25-2011, 08:34 AM   #1
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Open Contactor on Lennox A/C Condenser 10ACB30


I recently replaced my blower control circuit board on my Lennox G26 Series Furnace, and after replacing the circuit board, the contactor remains open. The contactor's terminals display the 24V. I can manually close the contactor, and the compressor runs.

Could it be the circuit board?

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Old 08-25-2011, 03:04 PM   #2
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Open Contactor on Lennox A/C Condenser 10ACB30


Where do you have the low voltage wires connected on the board that go to the outdoor unit.

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Old 08-25-2011, 06:36 PM   #3
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Open Contactor on Lennox A/C Condenser 10ACB30


If you have 120 volts to a lamp and the lamp doesn't come on when you flick the switch ,does that mean that wall socket is bad?
HVAC can be complicated but if you have voltage to anything and it don't work,what does that tell you.
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Old 08-25-2011, 07:33 PM   #4
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Open Contactor on Lennox A/C Condenser 10ACB30


if you have 24V on the condenser contactor connected or loose....ring the compressor coil out with the ohms setting on your meter...shut the condenser sisconnect off the 24Vs comes from the air handler/furnace not the condenser so you will only be working with 24Vs control ...and no being concerned with short cycling the compressor
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Old 08-25-2011, 09:40 PM   #5
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Open Contactor on Lennox A/C Condenser 10ACB30


Thanks for your response.

After further testing, I do not have 24V at the contactor. I have checked the thermostat, transformer and contactor, and they're OK. However, I'm not getting 24V on the circuit board 's thermostat cooling (Y) and fan (G) terminals that feed to the contactor. I visually examined the back of the circuit board, and there was no discoloration or appearance of an overload. Any other suggested tests to determine the open contactor problem.
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Old 08-25-2011, 10:08 PM   #6
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Open Contactor on Lennox A/C Condenser 10ACB30


Should be Y and C going to the contactor. No 24 volts between Y and C at the furnace terminal strip is a bad thermostat.
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Old 08-25-2011, 10:28 PM   #7
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Open Contactor on Lennox A/C Condenser 10ACB30


24 volts potential across the contractors, from each side?
Low voltage is not making.
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Old 08-26-2011, 07:57 AM   #8
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Open Contactor on Lennox A/C Condenser 10ACB30


Thanks, I will perform these checks and let you know if it is a bad thermostat.
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Old 08-26-2011, 07:59 AM   #9
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Open Contactor on Lennox A/C Condenser 10ACB30


After further testing, I do not have 24V at the contactor. I have checked the thermostat, transformer and contactor, and they're OK. However, I'm not getting 24V on the circuit board 's thermostat cooling (Y) and fan (G) terminals that feed to the contactor. I visually examined the back of the circuit board, and there was no discoloration or appearance of an overload. Any other suggested tests to determine the open contactor problem.
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Old 08-26-2011, 04:33 PM   #10
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Open Contactor on Lennox A/C Condenser 10ACB30


G isn't suppose to be connected to the A/C contactor. Y and C are to be connected to teh A/C contactor.
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Old 08-28-2011, 01:02 PM   #11
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Open Contactor on Lennox A/C Condenser 10ACB30


Once the Y was conncected to the C on the circuit board, everthing is working fine.

Thanks for your expertise and assistance.
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Old 08-28-2011, 01:05 PM   #12
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Open Contactor on Lennox A/C Condenser 10ACB30


Once the Y was conncected to the C on the circuit board, everthing is working fine.

Thanks for your expertise and assistance.

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