3 flash code


Old 12-25-17, 04:43 AM
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Join Date: Nov 2014
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3 flash code

American Standard system 90 had been getting a 3 flash code for pressure switch. I figured there was dirt or something causing it. I completely cleaned the entire system, but not the hoses. I'm still getting the error, but the system runs a lot quieter. I also have a torn grommet or gasket where the cover goes near the fire on the gas line coming in. I'm wondering if that's the cause. Any other ideas?
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Old 12-25-17, 09:57 AM
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Torn/missing grommets can be an issue.

Also clean the orifice in the draft inducer by removing the hose and using a very small piece of metal like wire, a small paper clip or a small drill bit to fully clear the tiny hole.

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Old 12-25-17, 11:58 AM
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Try tapping on the pressure switch firmly with your fingers when the unit starts up. I had the same issue and by tapping the switch the code stopped and the heater started working. So I ordered an new switch and it has been working fine since I replaced it.

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