no heating diamond 80
#1
01-24-23, 03:01 PM
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
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
#3
01-24-23, 09:27 PM
Forum Topic Moderator
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.
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.
jw2022
voted this post useful.
#4
01-24-23, 09:48 PM
Member
No call for heat. Blower and inducer fan runnng. Extremely dirty filter, sounds like one of the limit controls is open.
jw2022
voted this post useful.
#5
01-24-23, 09:52 PM
Group Moderator
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.
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.
jw2022
voted this post useful.
#6
01-24-23, 07:59 PM
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.
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.
#8
01-25-23, 06:19 AM
No call for heat. Blower and inducer fan runnng. Extremely dirty filter, sounds like one of the limit controls is open.
what is "limit control is open"? how to fix it?
the tenant is not changing the filter, I believe.
#9
01-25-23, 06:45 AM
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.
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.
