Signs Your Modulating Furnace Could Need Professional Repairs

A modulating furnace is a cost-effective and energy-efficient way to heat your Denver, NC, home. These furnaces feature variable-speed fans and automatically adjusting gas supply valves to match your home’s current need for heating. If you notice any of these issues with your heating system, it’s important to call for prompt modulating furnace repairs.

Yellow or Flickering Flame

Check the furnace’s flame at least once per month. The flame should be steady and blue. If you notice that it’s yellow or flickering, you need modulating furnace repairs. The furnace may not be burning the gas or venting the waste products properly, explains the Department of Energy. These problems require attention from qualified HVAC technicians.

Short-Cycling

Normal furnace cycles should last for three to 10 minutes. It takes this long for the heat exchanger to get warm enough to heat the air and deliver enough heated air to register a temperature change with your thermostat. If your furnace turns on and shuts off again within one minute, only to turn on again another minute later, you’ll need to call for modulating furnace repairs. The heat exchanger or blower motor may be overheating, which triggers the safety limit switch. When this switch is triggered, the furnace can’t turn on again for at least 60 seconds. You could also have a dirty air filter impeding airflow.

No Heat

If your modulating furnace isn’t delivering any heat, there could be a problem with the gas valve settings. At installation, the qualified HVAC technician sets the low-fire and high-fire settings on the gas valve. If this was done incorrectly, the furnace won’t burn fuel. It’s also possible that a safety issue caused the gas supply valves to close. In this case, you’ll need urgent modulating furnace repairs.

To learn more about when you’ll need modulating furnace repairs, take a look at Lakeside Heating & Air Conditioning’s heating services, or get in touch with our qualified HVAC technicians today.