Have HVAC Questions? Ask an HVAC Expert for Answers
Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Did you need help in finding a new module or what? What is this going into? Make and model of the unit itself?
What LED flash code are you getting when furnace shuts down?
So you let inducer come up to full speed, jump the pressure switch terminals and furnace still won't stay running??
The unit should never start with pressure switch terminals jumped. The board looks for an open pressure switch before it allows heat to work.
If it's starting with the pressure switch terminals jumped, you need to replace the board as this should NEVER happen!
The board does a check of pressure switch and looks for open pressure switch before allowing heat to start
Then you need to replace the control as this is not safe.
Pressure switch terminals should always be open until inducer comes up to full speed and the switch closes.
If you give me the full model number, I can help you find the right part number for the new board.
Model of the furnace, that is.
OK, hang on a minute
Seems to be something missing from that model number. Can you recheck? Or give me the full serial number?
How about serial number, please?
Not correct. Nothing coming up
The serial number is ***** correct
If I get exact serial number, I can see all parts for this furnace.
This is your replacement board. CLICK HERE. I have to leave for an emergency, but will reconnect when I return.
what else did you need?
You have 2 boards in this unit?
Neither the model or serial numbers you gave me brought up anything on the Trane website.
You don't want the thermostat board, that would not control the pressure switches. If you can send me a clear picture of the tag that has the model and serial numbers, I can look up. But that link I sent you is the replacement board for the part number, CNT2223
If you want to do that, that's up to you. I usually prefer the OEM board. Otherwise it may involve wiring changes that can get confusing to a laymen. I can look up the exact replacement if you can send me a clear picture of the tag that has the model and serial numbers, I can look up.
OK, so that link I sent you is the OEM replacement control. CLICK HERE. If you want to try that other replacement control, that's totally up to you.
Did you check my last reply?
Let me know if you need additional help. Otherwise, good luck! Thanks for using Just Answer and please don't forget to rate my service as that's how experts get paid (thanks in advance for any bonus left). Otherwise experts work at their own time and expense. Feel free to post back with any additional questions.