Open pressure switch, 1st stage.
Homeowner part this code names: furnace pressure switch hose.
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American Standard S9V2 E3.2 is an open 1st stage pressure switch. In the heating sequence the inducer starts and pressure switch 1 is supposed to close. The guide also says that if a thermal limit is open, 24 volts will not be present at either pressure switch, and that pressure-switch tubing has to rise so flue condensate does not run into the switch. E3.4 is the open 2nd stage switch, and low stage can still run on that one.
Likely causes
- 1st stage pressure switch did not close
Safe checks for E3.2
- The heating sequence says the inducer starts and pressure switch 1 should then close. If a thermal limit is open, the guide says 24 VAC will not be present at either pressure switch
- The install steps say pressure-switch tubing must rise so condensed flue gas does not enter the switch
- Techniciancheck the 1st stage pressure switch, its tubing and the inducer
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician if E3.2 remains. First-stage heat will not prove until that switch closes.
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Parts & tools for this fix
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Furnace pressure switch hose: guide
In this code: The install steps say pressure-switch tubing must rise so condensed flue gas does not enter the switch
Furnace pressure switch: guide
In this code: 1st stage pressure switch did not close
This one is for a technician to test or replace, so we only explain it and do not link to buy it.
Furnace inducer (draft) motor: guide
In this code: The heating sequence says the inducer starts and pressure switch 1 should then close. If a thermal limit is open, the guide says 24 VAC will not be present at either…
This one is for a technician to test or replace, so we only explain it and do not link to buy it.
High limit and rollout switches: guide
In this code: The heating sequence says the inducer starts and pressure switch 1 should then close. If a thermal limit is open, the guide says 24 VAC will not be present at either…
A safety device: we explain it but do not link to buy one.
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