Started out 3 burners would kick on, then top & bottom burners would kick off and on intermittently. Heard clicking sounds coming from gas controller like a relay switching on/off. Now, both blower motors won't turn off and unit will not ignite. It's a GNJ075M16A1 MODEL HEIL.
Sounds like "maybe" the burners need cleaning. Could also be an indication of other problems.
The blowers not shutting off could be what I call a failsafe "get your attention" function of the furnace's safety controls. Some manufacturers use this means of letting the homeowner know something isn't right and that the furnace needs attention.
Suggest you call a service company and have them check the furnace out because it sounds like there could be more than one problem.