carrier not pushing heat out to vents

______________________________________________________________________ I’m an EPA Certified Tech and my friends’ carrier furnace is not giving out heat out of the vents inside the home, I checked the temperature on , temperature off switch and it seems ok, the heat exchanger is Continue reading

replaced RTH 8100 with RTH 7500

______________________________________________________________________ I had posted the original queston November 25th. Per the response it was sugessted to replace the 8100 with something else. So I now have a RTH 7500 model and need to know which wires to connect. The wire Continue reading

ultrasx80

______________________________________________________________________ hello, the other morning I woke up to my heater fan motor running and no heat. the thermostat gave a filter message but it was clean.aftermarket washable/reusable. I tried to turn the fan off at the thermostat, but to Continue reading

Gas valve silenoid hum

______________________________________________________________________ I installed a White Rodgers electonic ignition kit on my furnace about 1 1/2 years ago. It uses a 36E86 392 gas valve. This year the main gas control solenoid has developed an unbearable loud hum. Any thoughts as Continue reading

AC dripping condensation all over furnace

______________________________________________________________________ Hi folks. Last month I had a brand new Lennox furnace & AC installed in my basement. Used it probably for a full week a couple wks ago when it was really hot. Didn’t notice any issues. Had it Continue reading

chiller error

______________________________________________________________________ good day every one,i am a new member of HVAC -Talk ,i am an operator of 800 tr Centrifugal Trane Chiller,last night ive incounter this problem regarding this, capacity limited by vane open travel stop, i only check fittings Continue reading