Supco Q108 Sequencer 1 TIMING, 1 SWITCH

The Supco Q108 is a universal 1‑switch electric heat sequencer used in electric furnaces, air handlers, and mobile‑home HVAC systems. It provides a controlled 1–25 second ON delay to stage heating elements and prevent inrush current. This sequencer is a direct replacement for many OEM single‑switch heat sequencers.

Designed for reliability, the Q108 controls a single heating circuit and ensures proper warm‑up and cool‑down timing for electric heat strips.

Key Features

• 1 switch / 1 timing circuit

• ON delay: 1–25 seconds

• OFF delay: Standard sequencer cool‑down range

• 24V control

• Universal replacement for many OEM sequencers

• For electric furnaces, air handlers, and mobile‑home HVAC systems

Common Symptoms Requiring Replacement

• Heat strips not energizing

• Furnace blowing cold air

• Heat stuck ON

• Intermittent or delayed heating