Goodman Furnace: Low stage pressure switch open, induced draft blower runs continuously
Low stage pressure switch open, induced draft blower runs continuously on a Goodman furnace: Induced draft blower keeps running and the furnace does not continue to operate.
Applies to: 34.5 in chassis gas furnaces
Common causes of low stage pressure switch open, induced draft blower runs continuously
- Pressure switch hose blocked, pinched or connected improperly
- Blocked flue and/or inlet air pipe, blocked drain system, or weak induced draft blower
- Incorrect pressure switch set point or failing switch contacts
- Loose or improperly connected wiring
How to fix low stage pressure switch open, induced draft blower runs continuously: step by step
- Inspect the pressure switch hose and repair or replace it if needed.
- Inspect flue and/or inlet air piping for blockage, correct length, elbows and termination. Check the drain system.
- Check induced draft blower performance and correct as needed.
- Correct the pressure switch set point or contact action.
- Tighten or correct the wiring connection.
- Turn power off before repair.
- Replace the pressure switch or the induced draft blower with the correct part if they fail.
Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 Service and Troubleshooting, p. 60. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.