Goodman Furnace: Grounding fault
Grounding fault on a Goodman furnace: The furnace doesn't run and the board is showing a grounding error. The control needs a solid ground and a good neutral before it will light anything, and a loose or poor neutral is the usual cause.
Applies to: 34.5 in chassis gas furnaces
Common causes of grounding fault
- Poor neutral connection
- Loose or corroded ground at the furnace or at the panel
How to fix grounding fault: step by step
- Turn power off before service.
- Verify the neutral wire connection to the furnace and its continuity to the ground source.
- Tighten and clean the neutral and ground terminals at the furnace and at the panel.
- Restore power and check for about 120 V between hot and neutral, with very little voltage between neutral and ground.
- Don't use the gas line as a ground.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 Service and Troubleshooting, p. 62. 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.