Furnace short cycles: starts, runs for a few minutes, then shuts off and restarts frequently.

Safety: Turn off power before removing panels or filters.

• Replace filter: Install a new filter of the correct size and MERV rating recommended by Alpha. Avoid overly restrictive high-MERV filters unless the system is designed for them.
• Open registers: Make sure at least 80% of supply registers are fully open and not blocked by furniture or rugs.
• Check blower performance: With thermostat fan set to ON, verify strong airflow from vents. Weak airflow may indicate a failing blower motor or capacitor.
• Monitor operation: After corrections, run the furnace and see if cycle length increases and comfort improves.

If short cycling continues, duct design or internal furnace issues should be evaluated by a professional.