My home has a York Diamond 80 furnace and has a history of intermittent no heat or blowing cold air for sometime. It flashes code 4 most of the time when it fails. But it also has symptom of flames goes out after ignition. So I have replaced new frame sensor, high limit switch and pressure switch and the code is still coming once every few heating call. HVAC technician is called and was not able to discover the issue. I finally found the problem seems around the big white connector to the control board at the top right corner.
When I wiggle the wires or the connector, the flame and furnace may shut off. If heating is called by thermostat and the furnace has no action and no code. Wiggle wire bundle or the connector will trigger the furnace to start its heating process. The control board is attach to a base that attached to the blower and small vibration can be felt. So the issue may be related to the connector or something near the connector on the control board.
I have tried to clean the female and the male pins to make sure they have good contact. But the problems persisted. My problem is that I do not know if the bad contact is in the connector or on the control board. Does anyone experience similar issue and how do you fix it?
By the way, the furnace can shut off in the middle of blowing warm air without any code. If wiggle the connector or wires bundle it will start the ignition process and produce heat again.
Yes.... that 12 pin plug can get corroded. Unplug it. Spray it with a small amount of contact cleaner and reconnect it to the board several times. If you don't notice a difference... in other words you still have an intermittent problem when moving that connector.... more than likely you have broken solder on one or more of the pins where soldered to the board. That would indicate the control may need to be replaced.
Thanks PJmax. You are right on. I found one suspected bad solder point on one pin. Resoldering it seems help. The furnace has consistently fired up more than 5 times. I Should be able to tell if it is finally fixed in a few days.
Hi. Could you help me with this problem?
My Trane XT-95 furnace blows hot air at first, then blows cold air after approximately 15 minutes.
Diagnostic light blinks 3 times, indicated pressure switch error, then I replaced the pressure switch, no dice.
Today, I replaced 3'' limit switch, no dice.
Should I buy flame rollout switch and try? Thank you.
Thanks and happy holidays
I just changed the pilot light assembly on my gas fireplace. In the attached photos there is a hard black substance at the bottom of the assembly on the old part that is used to seal the holes where the lines go thru. There is a photo of the holes after it was removed. I put the new assembly in. I'm wondering if it's necessary to reseal them and if so what is used to do that? It looks like it used to be some sort of putty.
Second issue! There is a photo of the brass tip that inserts into the burner assembly. On the burner assembly tube that goes over the brass part you will see an open slot. There is one on the other side also. That tip can be rotated so that the holes are covered or closed. What is the purpose of having those holes there? The brass part doesn't go very far into the burner tube so it seems to me that there would be gas escaping before it went into the tube. When I turned the fireplace on to test it, it seemed like the gas wasn't immediately spreading throughout the burner assembly. Any help or a bit of education on this would be appreciated.
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01-15-23, 04:36 PM
