Furnace Error Codes: What Does it Mean When It’s 31?

The process of heating materials to very high temperatures can be tricky. It’s a delicate balance between monitoring and controlling the heat while also ensuring that the system doesn’t break down. Furnaces are extremely useful devices, but they need to be handled carefully. Even with all the precautions in place, it’s not uncommon for a furnace to fail. Several different furnace error codes indicate something has gone wrong with your heating system. If you see these codes pop up on your digital thermostat or another readout, then you know there is an issue with your furnace. Understanding what these codes mean will help you figure out what needs fixing and how to go about doing so.

What Does Code 31 Mean?

The first furnace error code is 31, which means that the furnace is not receiving the right power. A furnace needs to be connected to a standard household circuit to work properly. If the circuit isn’t supplying enough power, the furnace will shut down. Because the furnace needs the power to function, a power outage would also trigger a furnace error code 31. If this is the case, you’ll get the code followed by “PF” which stands for power failure. In this situation, you’ll need to reset the furnace after the power comes back on. If you are getting a furnace error code 31 and there is no power outage, then you need to check the circuit for your furnace. This will be indicated by a circuit breaker switch or separate electrical panel.

Error Code 21

The second furnace error code is 21, which means that the temperature sensors are not properly calibrated. Sensors are used to monitor the furnace’s internal temperature and ensure that it doesn’t overheat. If the sensors are not calibrated correctly, then they may tell the furnace to shut down when they are in fact within the proper temperature range. This can cause the furnace to go into error mode and trigger the error code 21. This issue is relatively common and can be remedied by a professional. A technician will calibrate the sensors, ensuring that they are reading the right temperature.

Code 19: Vacuum Problem

A vacuum problem can cause several different furnace error codes. If there is too much back pressure in the system, it may trigger an error code 19. A clogged filter can also cause an issue with the vacuum. There are a couple of ways to remedy this problem. Make sure that the filter is clean and in the proper position. If necessary, you can also install a filter with a higher MERV rating to reduce the amount of backpressure. If the vacuum problem is more serious, then you’ll need a professional to look into it.

Code 20: Fan problem

A fan problem can be caused by a bad belt, a dysfunctional bearing, or a broken drive. If the belt is broken or missing, it will trigger error code 20. If the bearing is broken, then the fan won’t spin properly. And if the drive is broken, then the fan won’t be able to turn on. You can check the belt, bearing, and drive. If you notice an issue, then you’ll need to replace the faulty part.

Code 28: Electronic Failure

The furnace error code 28 is an electronic failure and means that the control board has shut down due to an internal error. This is a serious issue and may indicate a more serious problem with the furnace.

Code 32: Electronic Malfunction

Electronic malfunction is furnace error code 32, which means that there is a problem with the control board. This can be due to a wiring issue or an electrical problem.

Codes 33-39: Venting Problems

Venting issues can cause several furnace error codes. If there is too much back pressure in the furnace, it can cause overpressure in the venting. If the venting is clogged, then the warm air won’t get out of the house. And if the venting is too short, then the warm air won’t be able to reach the roof. You can remedy most of these issues yourself by cleaning the venting and making sure it’s long enough. If the issue is more serious, then you’ll need a professional to look into it.

Codes 43-49: Climate Control Problems

Climate control problems can cause several furnace error codes. If the furnace is set to the wrong heating mode, then it will trigger an error code 43. If the system is set to cooling mode, then it will trigger an error code 44. If the fan is set to run in the cooling mode and there is a heating pad on the system, then the furnace will trigger error code 45. And if the two systems have been set to the same mode, then the furnace will trigger error code 46. If you are getting any of these codes, then you’ll need to go through the settings on the thermostat to figure out where the issue is.

Codes 51-59: Mechanical Problems

This is the broadest category of furnace error codes and covers several different issues. If the motor is overheating, then the furnace will trigger error code 51. If the blower wheel is broken, then the furnace will trigger error code 52. If the motor isn’t getting enough power, then the furnace will trigger error code 53. And if there is too much backpressure, then the furnace will trigger error code 54. These issues can be difficult to diagnose, but you can look for obvious signs. If the motor is making strange noises, then it may be overheating. If the blower wheel is broken, then the fan won’t be spinning.

Codes 60-63: Summary

These last codes indicate that there is a problem with the thermostat. If the thermostat is not communicating with the furnace, then it will trigger error code 60. If the thermostat is in the wrong mode, then it will trigger error code 61. And if the thermostat loses power, then it will trigger error code 62. If you have any of these furnace error codes, then you’ll need to fix the problem as soon as possible. The furnace needs to be running properly to keep your home warm.

Conclusion

Furnaces are complex devices that often break down. It’s important to understand what these errors mean so you can take action as soon as they occur. Contact a professional if you can’t figure out how to fix the problem yourself. Not only will they be able to diagnose and repair the problem, but they can also recommend ways to prevent it from happening again in the future.