no heating diamond 80


  #1  
Old 01-24-23, 03:01 PM
J
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Question no heating diamond 80

Hi,
My furnace is not working. once I turn the power on, the control board indicator flash immediately and continuously. inducer and blower are on, I think.
According to diagnostic chart, it says "FLAME - NO CALL FOR HEAT"
The ignitor is not glowing, the gas never ignited.
I checked the resistance of the ignitor, seems to be ok(80 Ω).
I also check the voltage of ignitor, it says 0.
My control board is bad or the thermostat? do I have to check the flamer sensor?
Thanks for any help.
Best regards,
JW
 
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Old 01-24-23, 04:38 PM
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The next thing I would check is the flame sensor. Dirty or faulty.
 
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Old 01-24-23, 09:27 PM
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It's going to be the furnace control board.

I would verify the flame sensor is correctly installed and not shorting to the body of the furnace.
( you would have probably noticed this already if it was the issue)

I would measure the voltage between the flame sensor wire and the body of the furnace.
I almost never work on York or I would post the correct reading but Carrier is ~95 volts AC and every other furnace but the communicating Lennox is ~ 50 volts AC.
(Lennox communicating is ~3.7VDC)

It's going to be the furnace control board, not the ignitor or a bad flame sensor.
 
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  #4  
Old 01-24-23, 09:48 PM
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No call for heat. Blower and inducer fan runnng. Extremely dirty filter, sounds like one of the limit controls is open.
 
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Old 01-24-23, 09:52 PM
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Strange.... if the inducer is running.... that would be calling for heat or possibly an open limit switch. You should not get "flame sensed with no call".... as it appears it's being called.

A complete model number would be helpful. It's on a tag on the sidewall near the burner.
You could post the part number off the control board too.
 
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  #6  
Old 01-24-23, 07:59 PM
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cleaned the flame sensor, no luck. I have ordered the parts (flame sensor and ignitor), will try replace them when received.
Could the thermostat be the issue, which is not sending correct signal to the furnace?
I changed the temperature(54) to be lower than the room temperature(58), I watched for a few minutes, the furnace is still. on. fan is on auto mode.
 
  #7  
Old 01-24-23, 08:24 PM
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one more information, the filter is not changed for aged(seems).
 
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Old 01-25-23, 06:19 AM
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No call for heat. Blower and inducer fan runnng. Extremely dirty filter, sounds like one of the limit controls is open.
thanks for the tip.
what is "limit control is open"? how to fix it?
the tenant is not changing the filter, I believe.
 
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Old 01-25-23, 06:45 AM
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I watched a lot video. the starting sequence should be , inducer--->gas ignited--->(after quite a few seconds)blower
in my case, seems the blower is on shortly after the inducer.
I didn't smell gas, seems system is not trying to ignite the gas.
 
  #10  
Old 01-25-23, 06:52 AM
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WHITE-RODGERS
MODEL 50A50-241

 
 

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