What to Do When Your Furnace Blows Cold Air
A furnace blowing cold air instead of heat is a frustrating and uncomfortable experience. This guide explains the most common causes, what you can check safely, and when professional diagnosis and repair are needed.
Immediate Steps to Take
1. Check the thermostat fan setting — switch from ON to AUTO. The ON setting runs the fan continuously and will blow unheated air between heating cycles. 2. Check the gas supply — verify the gas valve on the gas line near the furnace is in the open position (handle parallel to the pipe). 3. Listen for burner ignition — when the furnace starts, you should hear the gas valve click open and the burners ignite. If you hear clicking but no ignition, the ignitor or flame sensor may need service. 4. Check for error codes — many furnaces have a small window with a blinking LED light that communicates fault codes. Count the blinks and refer to the panel diagram.
Next Steps
5. If the burners are lit but the air is cool, the heat exchanger or temperature limit may be malfunctioning. Professional diagnosis is required. 6. If you smell gas, evacuate immediately and call your gas utility from outside.
When to Call BC Wide
If the steps above do not resolve your issue or if you encounter any gas odour, carbon monoxide alarm, electrical hazard, or visible damage, contact BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning immediately. Our licensed technicians are available for prompt service across Greater Vancouver. Emergency service is available for urgent situations. Call (604) 330-3953 for fast, professional help.
Why Professional Service Matters
Attempting HVAC repairs without proper training and licensing can be dangerous — especially with gas-fired equipment. Licensed gas fitters have the training, diagnostic equipment, and parts to safely diagnose and repair your system. BC Wide Home Services Ltd, doing business as BC Wide Heating & Air Conditioning technicians are Red Seal certified, fully licensed, and insured for your protection.
Safety Reminder
If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.