A malfunctioning furnace can be a cause of great inconvenience during winter. Several factors can cause furnaces to stop working. Before your call a furnace repair expert, try to track down the cause of this problem. If you successfully diagnose the problem, you can provide vital information to your contractor when they arrive.
Here are some common reasons why furnaces stop working from Lafayette furnace repair experts, Connolly HVAC.
Can’t remember the last time you changed your filters? You are not alone. Filters are one of the most important, yet most neglected, parts of furnace maintenance. It’s no wonder that clogged filters are the number one cause of furnace failure.
A furnace filter traps airborne contaminants such as dander, pollen, mold spores, dirt, and dust. Over time, filters become laden with these particles.
Clogged filters can cause a number of furnace issues including:
- Negative airflow throughout your system, causing your heat exchanger to overheat and eventually break down.
- Become forced to work harder and longer, leading to astronomical energy bills.
- Inability to effectively block debris, dust, and other contaminants, resulting in low indoor quality.
- Damage to internal furnace components causing the system to shut down.
Though your technician will change filters during furnace repair sessions, you must check them between tune-ups. To steer clear of problems associated with clogged air filters, replace your furnace filters every 30 to 90 days.
Consider HEPA filters that trap more than 99 percent airborne contaminants as they are some of the best filters on the market.
When your thermostat does not function properly, it causes your furnace to either cycle on and off more frequently or turn-off completely.
Follow these steps to analyze if there is an issue with the thermostat.
- Ensure to set the temperature control selector to above room temperature.
- Check that the thermostat is on heat mode.
- Check to see if the fan switch is ON.
- Make sure the temperature setting is high enough to activate the thermostat.
- Check if your thermostat batteries are low or dead.
- Check every low voltage wire connection to your furnace.
- Securely attach each voltage wire coming out of the wall to the corresponding terminal.
- Make sure the thermostat wire connections at the furnace are secure.
Faulty Fuse Box, Circuit Breaker, or Switches
If the furnace switch is on, but the furnace does not turn on, check your circuit breaker to see if it has tripped. If this is the problem, reset your breaker. A tripped breaker could indicate a significant underlying issue with the electrical system. Have your electrician inspect your electrical system for issues to be on the safe side.
Faulty or Dirty Ignitor
If your furnace initiates the start cycle but does not turn on, you may have a faulty or dirty ignitor. To clean a dirty ignitor:
- Turn off the power to your furnace.
- Refer to your manual to locate the ignitor
- Once you locate the ignitor, remove it with a screwdriver.
- Gently rub the rod with medium-grain sandpaper.
- Clean the probe on the sensor.
- After removing dirt and debris, reassemble your sensor.
- Place the cover panel and tighten the securing screws.
- Be careful not to overtighten the securing screws.
- Turn on the power.
- Turn up the temperature on your thermostat.
If your furnace still doesn’t start, call a furnace repair expert in Lafayette.
The Propane Gas Supply to the Furnace is Not Open
Make sure the gas valve to your furnace is open. If the gas supply to your furnace gets disrupted, it won’t have enough fuel to operate. If you smell propane, leave your home immediately and call your propane supplier and contractor to fix the issue ASAP.
Faulty Condensate Pump
A condensate pump is designed to collect and disperse the hot water produced during condensation. If your condensate pump becomes plugged or malfunctions, your furnace can stop working.
When a condensate pump malfunctions, the condensate water may spill onto the floor around the base of the furnace. If an auxiliary outlet powers your condensate pump, check whether the Ground-fault Circuit Interrupter (GFCI) has tripped. If it has, reset the outlet.
If your condensate pump is hardwired into the furnace, turn off the circuit breaker and examine the pump. Check the tube running from the condensate pump to the outside to see if it is blocked or pinched.
Open the lid to the condensate pan. The draw tube should be at the bottom. If the condensate pump is overflowing, there could be a problem with the automatic switch on it. Manually flip the switch back and forth. If your condensate pump is still not working correctly, it will need a replacement.
Thankfully, condensate pumps are inexpensive and easy to replace. However, if your pump is hardwired into the furnace, consult a technician.
The Connolly Heating and Air Conditioning team consists of furnace repair experts in Lafayette. Whatever your heating problem, our pros will come up with a sustainable solution. To schedule a furnace repair session in Lafayette, call (925) 288-1408.