Remove the metal screws of the panel with a Phillips screwdriver.
Identify the metal slip connector attached to the wires. Pull the wires by these connectors. If necessary, use needle-nose pliers.
Use a multimeter to test the thermostat’s resistance by setting it to the RX 1 setting. Place each of the meter’s probes onto the wire terminals. You should receive a reading of 0. Resistance that is low, or near 0, means that the electrical flow is good. If the meter does not indicate 0, but reads infinity, your thermostat should be replaced.
