Goodman Furnace: Safety circuit overview
Safety circuit overview on a Goodman furnace: Primary limit: on the partition panel, normally closed, auto reset, watches heat exchanger temperature. Auxiliary limit: near the circulator, normally closed, manual reset, watches blower compartment temperature. Rollout limit: on the burner manifold, normally closed, manual reset, trips if flame is not drawn into the heat exchanger. Pressure switches: normally open (closed in operation), watch induced draft and coil front pressure taps for insufficient airflow or blocked condensate drain. Flame sensor: probe on the burner manifold that uses flame rectification to detect flame.
Applies to: All 34.5in chassis gas furnaces
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 service and troubleshooting manual, p. 37. 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.