How do you replace the sequencer on an Intertherm Furnace by Central Electric? The model # is FEH-012HA-03 Appliance # E0000088245, 240v 60hz 1ph, 51.3 amps.

Easy to replace. Remove defective one and install new one. Make sure you keep track of exactly where the wires are on the old one so you can put them back correctly on the new one.