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Old 04-23-2012, 06:27 PM   #1
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Diamond 80 furnace problem


Igniter lights, burners come on for about 5 seconds then the gas shuts off and of course burners go out. I power cycle the unit, same results. I am an Automotive Technician with Advanced electrical expirence so if anyone can give me a start, I would greatly appreciate it.
I was looking for a photocell of sorts but didn't see any.
P.s inducer motor runs continuously though, proving out the thermostat.
Thanks. Joe


Last edited by Jej34; 04-23-2012 at 06:34 PM.
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Old 04-23-2012, 06:34 PM   #2
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Diamond 80 furnace problem


start by cleaning flame sensor....

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Old 04-23-2012, 06:37 PM   #3
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Diamond 80 furnace problem


Flame sense problem by the sounds of it. Is this a hot surface ignition (glowing coil) system or a spark ignition?

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Old 04-23-2012, 06:54 PM   #4
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Diamond 80 furnace problem


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Old 04-23-2012, 07:15 PM   #5
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Diamond 80 furnace problem


Is the flame sensor a photocell. All I see is what're appears to be a thermocouple on the left and 2 round metal sensors near the burner ports but they are just metal(nothing to clean)
Igniter is element type, not spark.

Thanks Men
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Old 04-23-2012, 07:32 PM   #6
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Diamond 80 furnace problem


It is a hot surface ignition system. The" thermocouple" you are referring to should be a metal rod which may be the sensor. Try cleaning it as Ben's plumbing mentioned. Make sure you turn the power off, and be careful not to bump the igniter. Also make sure that the sensor is located directly in the flame. You should be able to see it good while the unit fires before it locks out.
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Old 04-23-2012, 07:44 PM   #7
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Diamond 80 furnace problem


Is this a downflow model?? Just because of the York recall for that model in the downflow style...

Your flame sensor will usually be in front of the burner that is farthest away from the igniter. One sheet metal screw holding it in place.
A clean fine steel wool works well.
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Old 04-23-2012, 07:46 PM   #8
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Diamond 80 furnace problem


Not down flow. Found sensor, I'll clean it up and see.

Thx
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Old 04-23-2012, 09:49 PM   #9
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Diamond 80 furnace problem


Cleaned it, working like a champ at the moment!

Thanks Men

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