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York P2MPD08N04801B furnace won’t light
Hi! I’ve had problems all winter with this furnace. Replaced the inducer motor, pressure switch, high limit switch, and flame sensor. After replacing the inducer motor and pressure switch, it has worked well for about a month and a half. Prior to that, I was getting lock out errors frequently until it finally just stopped lighting at all. I thought it was all good until last night when it stopped lighting and gave me the 7 red flashes again (ignition lock out.) It tries to light, but I am not getting a flame at all. The ignitor glows as it should, but none of the burners light. After three tries without lighting, the fan comes on and blows cold air. The burners are mounted horizontally with the ignitor in the path of the first burner. The flame sensor is in the path of the last burner.
The filter is clean...replaced 3 weeks ago.
It’s not quite warm enough here yet to go without heat, and I am out of work due to covid19, so funds are slim.
I did have the gas company out to check the gas pressure...they said it was good. I’m sorry I don’t remember what he said it was reading, but he did say more than enough pressure.
Furnace is in the basement, it’s natural gas, and fairly old (probably early 80s.) Any advice on what to look for...my son can help with replacing parts if necessary. I’m no hvac tech, but I’m intelligent and willing to listen. Thanks in advance.