Goodman Furnace: Measure inlet gas supply pressure
Measure inlet gas supply pressure on a Goodman furnace: Measure supply pressure with burners firing and other gas appliances on the same line running. Supply must fall within the rating plate range.
Applies to: Inlet gas supply pressure at gas valve
Common causes of measure inlet gas supply pressure
- Line pressure out of range
- Undersized gas piping
- Regulator fault
How to fix measure inlet gas supply pressure: step by step
- Shut off electrical power and the manual gas shutoff valve.
- Remove the burner compartment door to reach the gas valve.
- Install a hose fitting at the gas valve inlet tap or the gas piping drip leg.
- Connect a calibrated water manometer or gas pressure gauge.
- Turn on gas and power, and run the furnace and other gas appliances on the line.
- Read supply pressure with burners firing and compare to the table.
- Turn off unneeded appliances, shut off gas and disconnect the manometer.
- Reinstall the plug, turn gas back on and check for leaks.
- Reinstall the burner door and verify operation.
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 manual, p. 51. 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.