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Old 11-08-2012, 10:29 PM   #1
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York Diamond 80 lockout


Hello,
I am having trouble with a York Diamond 80 at work. We have multiple units. The circuit board is flashing 7( lockout after 3 attempts and no ignition). The unit is doing just that. The inducer motor runs, the ignitor glows and gas is ignited. 5 seconds after ignition the gas trips off. This repeats 3 times and the system locks out.

What I have checked/done: Like I said we have multiple units. I have switched out the flame sensor, pressure switch, circuit board and thermostat with a different working unit. All parts have worked in the other unit and my result was the same(lockout). I have also jumped out every sensor and limit switch that I can see/reach with the same results. The filter is clean, the exhaust vent and air intake are unblocked and clean. I also cleaned the flame sensor with fine steel wool.

I did have momentary success when the pressure switch was jumped out, But I could not duplicate it. I'm just looking for anything I may have missed or not thought of.

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Old 11-08-2012, 11:41 PM   #2
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York Diamond 80 lockout


pressure switch is not happy...look for plugged hoses or ports where pressure switch hooks to...

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Old 11-09-2012, 08:47 AM   #3
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York Diamond 80 lockout


I agree with the previous
Just had a furnace in Toronto with the same problem.
We just replaced the pressure switch hose, it was cracked.

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Originally Posted by carmon View Post
pressure switch is not happy...look for plugged hoses or ports where pressure switch hooks to...
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Old 11-09-2012, 12:45 PM   #4
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York Diamond 80 lockout


Thanks, Cleaned ports with a paperclip, inspected and checked hose...no leaks or cracks. still having the same result. I also checked the gas valve...24 volts....i"m stumped.
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