Furnace Limit Switch Replacement Cost in Vancouver
Published: July 22, 2026 — BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning — Greater Vancouver, BC
What the Limit Switch Does
The limit switch monitors heat exchanger temperature and shuts off the burners if the temperature gets too high. It is a safety device that prevents the heat exchanger from overheating and cracking. When the switch trips, the furnace blower continues running to cool the heat exchanger.
Signs of a Failing Limit Switch
The furnace shuts off before reaching the set temperature but the blower keeps running, the furnace short-cycles, it displays a limit switch error code, or the switch is stuck open (furnace never starts). A switch that trips repeatedly indicates restricted airflow or a failing blower — not just a bad switch.
Replacement Cost
Limit switch replacement costs $250-500 including part ($30-80) and labour ($150-300). If the new switch also trips, the underlying airflow issue must be diagnosed — this may add diagnostic time and cost for addressing the root cause.