Original message
| just_1_pint
 |  "York Diamond 80 question"
, posted Fri 24 Oct 00:57  
I have a York Diamond 80 P2MP model furnace (1993) that as of late is being quite the pill.
When the thermostat gives the call for heat the furnace goes through the normal process. The ignitor glows, inducer blower starts, after a few seconds the ignitor dims and then glows again, the gas valve opens but only 5 of the 7 burners ignite causing the gas to shut off, then the process starts again.
I assume that because there is no flame hitting the flame sensor which is located on the 7th burner is the cause for the gas to shut off and the cycle to restart again.
This does not happen 100% of the time, but it is begining to happen more and more. I have checked the vent for blockage, replaced the filter, and over the course of the last year have replaced all the rollout sensors, high limit switch, gas valve, control board, ignitor, thermostat, and last but not least the flame sensor. I have cleaned the heat exchanger and the main burners, and checked to make sure that there is nothing blocking the flow of fresh air to the furnace.
I have added a gas supply line to a new gas stove for the kitchen, but this problem started before i did that and the added gas feed for the stove is behind the furnace feed.
Now I am stumped, scratching my head wondering if this is a gas pressure issue that has somehow happened over the years. I am not at all opposed to calling in a professional but thought I would consult the expertise of a veteran here before I did.
Any insight would be appreciated.
Thank you
just 1 pint
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Replies:
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| TKG26
| "Re(1):York Diamond 80 question" , posted Fri 24 Oct 07:02
Sounds like either poor gas pressure(use a manomator to check your manifold shoudl be 3.5-4"WC depending on the vavle) or it could be your HSI is starting to fail. Not sure if that york uses them but i the round hsi that they use start to dim before the fail, if your not getting a really good ignition off of the hsi the delay can cause you poor lighting.
You said u cleaned the burners? How did u remove them to clean them?
SIGNATURE "Always have a licensed HVAC technician perform repairs on your equipments. HVAC is not a do-it-your-self home project."
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| | just_1_pint
| "Re(2):York Diamond 80 question" , posted Fri 24 Oct 20:19
Thank you for your insight TKG26. For the burner removal - I removed the access door, remover the ignitor, turned off the gas supply, removed the airshield, removed the burner assembly, removed the burners from the burner assembly and cleaned the inside out with a soft cloth.
Actually your question led me to take the burners off again and inspect them which led me to the solution to my problem. At the end of the burner which shoots the flame into the cavity of the furnace there is a round cylinder with smaller holes in the shape of a circle. On each side of the larger cylinder are small grooves that let the gas pass from one burner to the next which ignites all the burners. I cleaned the groves out with an xacto, and was suprised at all the buildup that was blocking them. After reinstalling the burners the furnace fired up normally and runs fine.
Thank you for your comment.
just 1 pint
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| | TKG26
| "Re(3):York Diamond 80 question" , posted Fri 24 Oct 22:41
Thats great news, and you sound like you had done a good job, i asked because even amoungst hvac techs the term "cleaned the burners varies from tapping them with a screw driver and blowing at them to removal and using some elbow grease) as you did
SIGNATURE "Always have a licensed HVAC technician perform repairs on your equipments. HVAC is not a do-it-your-self home project."
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