White-Rodgers 50A55-743 Control Board

A 50T55-based board was used originally Two hundred and ninety-nine units were produced In my application, there were a few terminals I did not use on this new board. It's not that big of a A delay can also be adjusted on/off the board with the new model. It's relatively easy to replace a motor Examine the connections on the old board (I have taken photos for safety), and connect the new board in exactly the same way.
The diagnostics for the faulty board were not so straightforward I. - To find a service manual for a particular unit on Google, first go to the manufacturer's website. I. - something goes wrong with the control board, a small LED will flash a certain number of times to tell you where to start looking (in my case, heat wouldn't come on and my LED flashed three times, which indicated a problem with the In the service manual is a reference chart that can be used to decode the flashes of LEDs. I. - When the inducer fan was running, I tested the pressure switch with my Harbor Freight multimeter (free with coupon) and saw that it indeed closed when it was running (evidenced by voltage on both the wire leads). It can also be concluded that there is no blockage in either the connection hose or the air duct. So it appears that the pressure switch is good, but why are there three I. - The next in the sequence is the ignition device. Ignitor failure is commonly caused by cracks in the ignitors. My free harbor freight multi meter thus provided me with the means to test the resistance of the two wires by unplugging it and placing the probes on them The ignitor is good if it has a resistance of 68 ohms (spec is between 50 and 300). I. - In order to test voltage being sent to the ignitor, we must measure that voltage. During the cycle, 120 volts AC needs to be sent (and the control board determines when this needs to be sent). When the inducer fan first starts, when the pressure switch closes, the ignitor should become hot, but it does not. The control board does not provide voltage to the ignitor. This would mean that the control board is bad (But it is not impossible to fix with $45 to Amazon! My favorite thing about not having to pay a ridiculous fee to the local HVAC techs is not making them earn a fortune. Quite a few hundred dollars have been saved thanks to my efforts and one and a half or two hours of my time. A capasitor I purchased for $10 once cost me $445! It is a separate incident the following day when the heat breaks again and they switch the thermostat to That thermostat is nice, but it still doesn't turn on the heat! In fact, I could certainly play one on television now! Although I am not an HVAC tech, I could certainly play one on TV.

Ada Wilson

| Sep 08, 2020

The burners were not lighting up even after it tried to start up numerous times. A few of the usual suspects have been tested In addition to the pressure switch and flame sensor, there are also roll sensors However, all of them seemed to be within specifications, including HSIs and out switches. In light of the fact that it received the right voltage input, but didn't seem to want to open the gas valve, the gas valve was clearly the culprit. As a result, I ordered a replacement gas valve and resigned myself to calling a local contractor once I received it to swap it out - neither of us have the equipment to calibrate gas valves, nor are we comfortable working with gas piping. In addition, while waiting for the gas valve to be ready for pickup- A few days later, I did some additional research on the furnace control board. It turned out that several people with Goodman furnaces had also switched out their gas valves only to discover that the problem was caused by the control board. My furnace's control board, part number 50T55, needs to be replaced 50A55, which was once made and sold, is no longer available, but the previously used 03 is The 743 replacement appeared to be the most promising. With a $50 stake (including next day), it was a relatively cheap wager. I got it here and it only took about fifteen minutes to swap out the old one and put in the new one. However, I noticed two additional pins on this board that have no significance and can be ignored. Otherwise, the board is identical to the old one. A line of symmetry is even seen on the mounting standoffs. My furnace lit right up when I turned it on. It went through the sequence and then lit itself. It has come to my attention that these Goodman furnaces are prone to control board failures every three years I have been at it for five The reason is probably that there is not enough thermal and mechanical It's never too late to replace them, but they are fairly inexpensive at least. In case it happens again, I will order another one to have on hand, hoping it takes another five years before that event occurs again.

Keilani Knox

| Sep 12, 2020

I didn't have any pressure switch issues. . . It may be this control board and not the pressure switch if you are reading this. It was time to replace the pressure switch on my Goodman furnace. Whenever I troubleshoot it, this old CB led light does not light up at all. I knew it was this part, as when I tested it, this old led light did not light up. The led light blinking to 3 flashes was restored upon the wire being reconnected, which proved the pressure switch was to blame. The P can be ordered now. My error message is still the same. The induction motor was removed and the P was checked. I checked the tube hole and found it to be I have bypassed and shorted the PS, and I still get the same error message. We ordered this newer version of 50A55-C and placed an order with it It should have been a 743 control board. Please make sure it is the right one. Upon delivery, the part was labeled with all wiring before being plugged in to the new circuit board. Since then, everything has worked and it is now our fourth day of working. By doing this, I am saving myself from having to call a technician. Ultimately, I will end up contacting the pros if this does not work.

Lily Turner

| Jul 12, 2021