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Replacing Cad Cell in Beckett AFG Burner
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- Опубліковано 18 кві 2021
- Replacing the cad cell in my Beckett AFG burner on my boiler. Old part number of cad cell removed was Honeywell p/n 120320 which was replaced with an Oilco p/n OC-10 No. C554a.
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If your going to replace the cad cell its best to replace the whole thing 99% of the trouble with them is old broken wires or the housing the eye plugs into has play in it.The difference in price is minimal.
My oil furnace one day stopped working, doesn't start. Oil pressure ok. But I changed the oil filter and nozzle. Again oil pressure ok. Again oil furnace doesn't start. Check the spark it's ok. Again oil furnace won't start. Check the peephole to see if I’m getting spark, no spark. Replace the cad cell and transformer. But I get a spark when I took the nozzle/electrode out of the burner head. So I left the peephole open, guess what? The furnace started. This is completely the opposite of what the cad cell does. I double-check the cad cell, high resistance with no light, low resistance with light. Again cad cell is brand new. The oil furnace only starts with the peephole open, then I close the peephole and it runs great, very smooth. But won’t start up the next time the thermostats want heat on. What’s going on???
I can't tell either... sounds like you need to have a tech come check it out :/
I would replace nozzle . Check electrodes setting and porcelain insulators for cracks
Look down the blast tube to make sure all is ok.
I would check the chimney for blockage and draft settings. Could also be the heat exchanger needs cleaning.
Air intake adjustment?
How'd you diagnose a bad cad cell?
You can measure the resistance of the cad cell.
How do you know yours is bad?
By testing the resistance.
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