Can Changing A Thermostat Fry A Furnace Board

You plough on your heat, so smell burning plastic or metal, or a foreign electric smell. What is it? It's from the furnace. It could be the control board. My furnace has a control board?

Furnace control boards can get bad. They can curt excursion and fry, giving off that aroma. Is at that place any hope this is a DIY job? Here'south how to check and know if it's the control board. It might be replaceable. Here'south what to know and the steps to have.

How to Check a Control Board

Don't panic. You don't need to trash the whole furnace and heating system. First, let's figure out if it'south the command board or some other issue.

1. Take off the furnace access panels – Remove the front admission panels. The control board is unremarkably located in the bottom department, most the blower.
2. Cheque the control board – Now y'all tin run across the command panel. Does information technology have whatever fire, melting or blackened marks like a spark or short happened? Are at that place strange smells? Sometimes a control lath volition have clearly exploded. If this is what you run into, the control board is done.
3. Bank check the command board light – The next affair to audit is the board's diagnostic or indicator calorie-free. Normally, the light will blink a detail number of times. Information technology's meant to tell you what is going on in the control lath. For example, 3 flashes tin can bespeak the furnace's inducer pressure switch is not working. If the board has no power, the light will exist off. Inspecting the command panel's diagnostic calorie-free will tell you lot exactly what is happening with the furnace. In fact, many times there won't be any business organisation with the command lath itself. The issue is in another part of the furnace.
4. Test power going to the board – If the control board's light is not blinking, you lot should check if power is getting to the control board. Check the wire that powers the control board. The wire is generally black with "120VAC Hot" on it. If the furnace has a door switch, you should encounter it is pressed in. Y'all can use tape to go along the switch down. You'll need a multimeter to test for electricity in a furnace. If the command board has 120 volts of ability entering it, then it has power. If the lath has power, only the diagnostic low-cal is still out, the lath is most probable failed and needs to be changed.
5. Check the terminals – Later on y'all know there is power to the control lath, yous can move on to test other parts of the furnace. Before anything else, turn off the furnace. Next, using a wire, connect the R and G terminals. Turn the furnace on. The blower should start. To test the rut, connect the R and W terminals. To test the cooling, connect the R and Y terminals. If the furnace turns on after testing the terminals, there isn't a problem with the control lath. The trouble could be with the thermostat.
6. Check the power going out from the control lath – The next affair to check is for power exiting the board. This is tough since you have to know what each terminal on the console is for. Outset, use a multimeter to get the output from the control board. About control boards utilise relays to activate and turn off other components such as the blower, ignitor and valve. The bulk of heating systems take a wiring diagram on the within of the door or panel. The diagram helps you locate what points you need to evaluate. You'll also demand to understand the furnace'southward order of operations. Occasionally, a control board won't activate your furnace but it'southward really another issue such as a pressure switch. If you can't find other bug with the furnace, and at that place is no voltage output to the rest of the components, then it'due south possible the command board is done.

What to Practise if the Control Board is Shot

If it looks like the command board is broken, you'll most always have to supersede information technology. Replacing a control board is complicated because many wires are attached to it. Y'all must have the verbal, uniform control board for the furnace.

When replacing a control board, it's a valuable idea to take a moving-picture show of the existing board to see how it's wired. You can refer to the photograph when installing the new ane.

Changing a Furnace Control Board

Changing a furnace's control board is a complex task. It'south recommended that, if yous're in doubt, contact a professional technician. If you lot accept the noesis and what to requite it a DIY try, here are the main steps.

Should I Effort to Set My Furnace'due south Control Lath?

1. Close off power to the furnace – Cutting the power to the furnace is disquisitional earlier working on information technology. There are wires and circuits. You don't want a hazard or injury.
2. Open the furnace – Accept off the admission panels on the furnace and get to the control lath. On some models, you might need to move or remove other components to get to the control board. This is when you should accept photos of how it's set before removing it.
3. Disconnect wires from the board – Remove all of the connectors and wires until null is attached to the board.
4. Take the control lath out of the furnace – After disconnecting everything, take the board out. The control board is usually attached by a couple of screws.
5. Install the new control lath – Hither is a good fourth dimension to set up whatever kind of switches or jumpers if the control board has them. Follow the exact same settings the sometime control board had. Adhere the new lath inside the furnace the same way the old one was.
6. Reconnect wires – Now reconnect the wires and connections, using the pictures of the old board, to the new board.
7. Shut the furnace – If you lot have to motion other parts to get to the control board, reassemble those. So put the access panels dorsum on.
8. Turn power dorsum on and test the furnace – It's the moment of truth. Turn the power on. Turn the furnace on. Exam information technology by changing the thermostat.

At South End Heating and Air we specialize in HVAC and furnace repair, telephone call us for a gratuitous consult. We'll evaluate your system and help make recommendations for optimum value. Afterwards all, we want to keep you lot cool all summer long and warm in the winter. Just schedule a visit with ane of our technicians to talk nearly how we tin help with your heating needs. Would you similar to larn more than options our techs can help you with? Give us a telephone call 704-684-5339.

Source: https://southendhvac.com/how-to-know-my-furnaces-control-board-is-fried/

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