Goodman Furnace: Measure and adjust manifold gas pressure (36J54 valve)
Measure and adjust manifold gas pressure (36J54 valve) on a Goodman furnace: Manifold pressure is measured with burners operating. Only small variations should be made with the valve pressure regulator. Do not derate the furnace by setting manifold pressure below the rating plate value.
Applies to: 36J54 gas valve, natural and propane
Common causes of measure and adjust manifold gas pressure (36j54 valve)
- Manifold pressure outside the table range
- Regulator out of adjustment
How to fix measure and adjust manifold gas pressure (36j54 valve): step by step
- Shut off gas at the manual shutoff, then shut off all electrical power.
- On the White-Rodgers 36J54, back the outlet pressure test screw out one turn counterclockwise (no more than one turn).
- Attach a hose and manometer to the outlet pressure tap.
- Turn on gas and power, then run the high fire or low fire test.
- Adjust the high fire or low fire regulator so manifold pressure matches the table.
- Turn off gas, remove the manometer and reinstall the test screw and plug.
- Turn on gas, check for leaks and verify operation.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 service manual, p. 52-53. 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.