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ErrBase

Goodman Furnace F02 Error Code: Pressure Switch Stuck Closed

Quick Answer

Goodman F02 means the pressure switch is stuck in the closed position before the inducer motor runs. This is different from a pressure switch that fails to close - F02 fires because pressure is detected when it should not be. The most common cause is a clogged condensate drain line backing up into the pressure switch hose.

Goodman F02 means the pressure switch is stuck in the closed position before the inducer motor runs. This is different from a pressure switch that fails to close - F02 fires because pressure is detected when it should not be. The most common cause is a clogged condensate drain line backing up into the pressure switch hose. Disconnect the hose at the switch port: if F02 clears, focus on the drain. Also check for kinked or collapsed hoses. The pressure switch itself (part B1370187) costs $20-40 and is an easy swap if the drain is clear.

GoodmanFurnaceSeverity: moderateDifficulty: intermediate82% DIY Success
Time to Fix
20–60 min
Difficulty
intermediate
Parts Cost
$8 – $40
Tools Needed
Multimeter, Wet/dry vacuum

What Does the F02 Code Mean?

F02 fires when the furnace senses the pressure switch is already tripped before the inducer starts. Usually a backed-up condensate drain or kinked hose. Quick to diagnose by disconnecting the pressure switch hose.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Condensate drain line plugged or frozen40%
Pressure switch hose kinked, collapsed, or blocked24%
Cracked or damaged inducer housing creating false pressure reading22%
Pressure switch failed in closed position14%

Symptoms You May Notice

  • Furnace not starting at all
  • LED flashing F02 on control board
  • No inducer motor sound when thermostat calls for heat
  • Furnace attempts to start, fails immediately

Can you reset a Goodman furnace to clear the F02 code?

After clearing the condensate drain or replacing the faulty component, flip the furnace circuit breaker off for 30 seconds, then restore power and call for heat. If F02 returns immediately, the drain or hose has not been fully cleared.

Tools Required for Diagnosis

MultimeterWet/dry vacuumFlashlightPliers

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

With power OFF, locate the pressure switch on the inducer housing

With power OFF, locate the pressure switch on the inducer housing. Disconnect the small rubber hose from the switch port and restore power. Call for heat and observe if F02 clears.

2

Inspect the condensate drain line from the furnace to the drain point

3

Trace the pressure switch hose from the inducer housing to the switch

4

Test the pressure switch with a multimeter set to continuity

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Pressure SwitchB1370187 · $20–$40
Condensate Drain Hose KitB1751711 · $8–$18

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $24 (Parts) vs $2350 (New Machine)

Frequently Asked Questions

What is the difference between F02 and E5 on a Goodman furnace?
F02 specifically means the pressure switch is stuck closed before the inducer starts, indicating pressure when there should be none. E5 is a general pressure switch circuit fault that can be open or shorted. F02 points more directly to a condensate drain or hose issue.
How do I clear a Goodman condensate drain?
Locate the condensate trap and drain outlet (usually near the furnace base or in the drain pan). Use a wet/dry vac on the outlet end for 30 seconds, then pour a cup of warm water into the trap to verify flow. Repeat if necessary. Avoid harsh chemicals that can damage PVC fittings.
Can I run my furnace with the pressure switch hose disconnected?
No. Disconnecting the hose is only a diagnostic step to confirm F02 is pressure-related. Operating with the hose off bypasses a safety sensor that monitors inducer operation and venting. Reconnect after diagnosis.

Related Goodman Furnace Error Codes

Code: HUBGoodman Furnace Error Codes: LED Flash Code Guide for GMVC and GMSS SeriesCode: F01Goodman Furnace F01 Error Code: Ignition Failure After 3 AttemptsCode: E5Goodman Furnace E5 Error Code: Pressure Switch ErrorCode: RESETHow to Reset a Goodman Furnace and Clear Error Codes

Models Known to Experience F02 Errors

This repair applies to most Goodman furnaces with this error code. Common model numbers include:

GMVC96, GMSS92, GCVC96, AMVC96, ASST96

Last verified for technical accuracy on March 14, 2026