Set the multimeter to ohms or continuity when testing each thermostat or safety fuse.

Remove at least one wire from each thermostat or fuse to prevent false readings.

Verify each large terminal shows near 0.00 ohms or a beep of continuity if in working condition.

Check small terminals for around 9000 ohms on sensor style thermostats, replacing them if values are off.

Replace any component that reads open line (OL) or has abnormal readings.