Common Furnace Repair Questions and Answers

Welcome to your guide on common furnace problems in the South Bay area. Whether your furnace refuses to start, makes strange noises, or simply isn’t heating your home, we’ve compiled the most frequent questions and answers to help you troubleshoot. Serving the South Bay, our aim is to ensure your home remains warm and comfortable all winter long. Here’s what you need to know about maintaining your furnace’s health.

Here are five common furnace repair questions along with their answers:

Why is my furnace not turning on?

Answer: There could be several reasons for this:

Power Issues: Check if the furnace is plugged in and if the circuit breaker hasn’t tripped.

Thermostat Problems: Ensure the thermostat is set to “Heat” and the temperature is above the room temperature.

Pilot Light or Ignition: For gas furnaces, check if the pilot light is lit or if there’s an issue with the electronic ignition system.

Filter: A clogged filter can prevent the furnace from turning on; try replacing it.

If these checks don’t resolve the issue, professional diagnosis might be needed.

Why is my furnace making a loud noise?

Answer:

Banging or Booming: This could indicate delayed ignition, where gas builds up before igniting, suggesting issues with gas flow or the ignition system.

Screeching or Squeaking: Often due to a belt that needs lubrication or replacement.

Rattling: Loose parts or panels might need tightening.

Humming or Buzzing: Could be from an electrical issue or a motor problem.

Noises should be checked by a professional to prevent further damage or safety hazards.

Why does my furnace keep shutting off?

Answer:

Overheating: This might occur if the filter is dirty, obstructing airflow, or if the furnace is undersized for the space.

Limit Switch: This safety device might be tripping if the furnace is getting too hot, indicating issues with airflow or thermostat settings.

Flame Sensor: If dirty, it might cause the furnace to shut down. Cleaning it can often fix this.

A technician can diagnose if the issue persists.

My furnace is running but not heating. What could be wrong?

Answer:

Thermostat: Check if it’s malfunctioning or incorrectly set.

Gas Supply: For gas furnaces, ensure the gas valve is open and there’s gas supply.

Pilot Light or Ignition: The pilot might be out, or the ignition system might have failed.

Blower Issues: The blower could be running, but not distributing heat if the heat exchanger or other components are faulty.

If these checks don’t help, professional service is recommended.

How often should I change my furnace filter?

Answer:

Frequency: Typically, furnace filters should be changed every 1 to 3 months, but this can vary based on:

Usage: More frequent use might require more frequent changes.
Filter Type: Pleated filters might last longer than fiberglass ones.

Environment: Homes with pets, smokers, or in dusty areas need more frequent changes.

It’s good practice to check the filter monthly and change or clean it as needed to maintain efficiency and air quality.

Remember, while some basic troubleshooting can be done at home, many furnace issues require professional attention for safety and efficiency. If you’re unsure, it’s best to call a certified HVAC technician. Contact us today!