Keeprite furnace cold air problem in Greater Vancouver

When your Keeprite furnace blows cold air instead of warm, it is one of the more common winter complaints, and the cause ranges from a simple thermostat setting to a furnace that is locking out on a safety fault. Working through the possibilities in order helps you fix the easy ones quickly and know when it is time for a licensed technician.

Why a Furnace Blows Cold Air

A Keeprite furnace blowing cold air usually falls into one of a few categories. The thermostat fan may simply be set to on instead of auto, so the blower runs continuously even between heating cycles, pushing room-temperature air. Alternatively, the burners may be failing to light or shutting down on a safety fault, so the blower runs but there is no heat behind it.

A flame sensor that cannot confirm the flame, a tripped limit switch, or a pressure-switch fault can all cause the burners to shut off while the blower continues, which feels like cold air from the vents. The control board may flash a diagnostic code that points to which one.

• Thermostat fan set to on runs the blower without heat between cycles
• A flame-sensor fault can shut the burners but leave the blower running
• A tripped limit switch cuts the burners while the blower cools the system
• A pressure-switch fault from a blocked vent can stop combustion

Safe Checks to Try First

Start with the thermostat. Set the fan to auto rather than on, confirm it is in heat mode, raise the setpoint above room temperature, and replace the batteries if applicable. Then replace a dirty filter, open all registers and returns, and clear the outdoor intake and exhaust terminations of leaves, snow, or debris.

These steps resolve a surprising number of cold-air complaints. What you should not attempt is any work on the burners, flame sensor, gas valve, or limit switch, those involve the gas and combustion systems and belong to a licensed technician. If you smell gas, leave the home and call your gas utility's emergency line first.

• Set the thermostat fan to auto and confirm heat mode
• Raise the setpoint above the current room temperature
• Replace a dirty filter and open all registers and returns
• Clear the outdoor vent terminations of debris

When to Call a Pro

If the furnace still blows cold air after the thermostat and airflow checks, the burners are likely not lighting or are shutting down on a fault that needs professional diagnosis. A licensed technician can read the diagnostic code and inspect the flame sensor, limit switch, and ignition system safely. HeatLand can find out why your Keeprite furnace is blowing cold and bring real heat back.

Frequently Asked Questions

Why does my Keeprite furnace blow cold air but the fan still runs?

Often the thermostat fan is set to on, so the blower runs constantly even when there is no heating cycle. It can also mean the burners shut down on a safety fault while the blower keeps running. Set the fan to auto first to check.

Is the fan-to-auto fix really that common?

Yes. Many cold-air complaints are simply the fan set to on instead of auto. Switching it to auto means the blower only runs when the furnace is actively heating, which usually solves the perceived cold-air problem.

Could a blocked vent make my furnace blow cold?

It can. A blocked outdoor termination can trip the pressure switch and stop the burners, so the blower runs without heat. Clearing the vents is a safe check worth doing, especially after Lower Mainland storms.

What if the furnace blows cold even with the fan on auto?

Then the burners are likely not lighting or are shutting down on a fault. This needs a licensed technician to read the diagnostic code and inspect the flame sensor, limit switch, and ignition system safely.

HeatLand Heating & Cooling is a licensed and insured, TSBC-certified HVAC company serving homeowners across Greater Vancouver. Our technicians diagnose the real fault, explain your options in plain language, and complete the work safely and to code.

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