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Are you getting code on thermostat or unit?If thermostat give me model on thermostat from inside cover. If furnace,
Can you give me complete model from inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel
OK this is a voltage not sensed issue. Is this anew installation or has thermostat been replaced?
OK this is a pretty complicated unit.My suggestion since most likely under warranty is to get the installer back out to troubleshoot and check his wiring.Either the board is failing or something is wired incorrectly.
What is serial number on unit? I would think this is still under warranty?
Just your luck Seems event he warranty has just expired even if registered (10 yeas)Do you have a volt meter and di you want to try to troubleshoot yourself to see why we are not getting 24v to high stage contactor?
OK first lets make sure thermostat is calling for second stage. Check between C and Y1 and between C and Y2 to make sure we are getting 24v from thermostat
OK let me verify you are using the conventional terminals Y1.Y2,R, C,O, etc and not the comminuicating terminals ABcD.
Ok if using the communicating tstat, you are not going to be able to troubleshoot yourself as we are not using the standard 24 volt wires but rather data transfer through the computer boards.You will need an authorized Carrier dealer to troubleshoot this.
Wish it was simple ,but these darn things can be a bear even for an experienced tech who deals with them everyday.Since everything is controlled by computer boards instead of simple relays in days past , a lot of guessing goes on in troubleshooting. I will not just take a guess and have you do more damage than good. I have spent a bit of time with you but would rather request a refund for you if not happy with my answer than makes guesses as some might
Not a problem Will send to administrators