I have Trane TUJ100A960A1 gas furnace with following
problem (I will describe furnace behavior as I have seen it).
Early in the morning I’ll typically move the thermostat up few
degrees to get furnace to kick in. Let’s say the room temperature
is 64 degrees. I’ll set thermostat to 68.
Furnace kicks in, runs for few minutes and after the temperature
goes up approx 1 degree (65), it kicks out. Fan blower motor
runs short while longer then it stops. Thermostat displays “temporary”.
Now the furnace just sits like his for a long time. It does not run.
If I move thermostat to let’s say, 69 it gets ignored.
If I bring it down bellow current room temperature, down to 64
I’ll hear a little click on the thermostat. Now, if I move it back up
to 68, I’ll hear the heat induction motor kick in at the furnace,
I’ll se the igniter light up, I’ll hear the gas hiss, and get ignited.
Seconds later I’ll hear thermostat klick off although no one
touched it, and the burners shut off. Blower motor kick in,
and runs for few minutes, the it too, shuts off.
Then for the rest of the day, nothing will change.
Thermostat will click every few minutes calling for heat,
yet furnace will not respond. To correct this situation I have to
turn the thermostat off, and cut A/C power to the furnace,
wait few minutes, and turn everything back on, all may be well
for a day or two. Then back to the same ol’, same ol’.
I have checked the following to be good:
Induction motor, its switch, vent tube, exhaust flue,
Igniter, and flame sensor.
There are no loose connections. Filter is clean.
I assume something sends the furnace into "lock out" mode,
but what???
problem (I will describe furnace behavior as I have seen it).
Early in the morning I’ll typically move the thermostat up few
degrees to get furnace to kick in. Let’s say the room temperature
is 64 degrees. I’ll set thermostat to 68.
Furnace kicks in, runs for few minutes and after the temperature
goes up approx 1 degree (65), it kicks out. Fan blower motor
runs short while longer then it stops. Thermostat displays “temporary”.
Now the furnace just sits like his for a long time. It does not run.
If I move thermostat to let’s say, 69 it gets ignored.
If I bring it down bellow current room temperature, down to 64
I’ll hear a little click on the thermostat. Now, if I move it back up
to 68, I’ll hear the heat induction motor kick in at the furnace,
I’ll se the igniter light up, I’ll hear the gas hiss, and get ignited.
Seconds later I’ll hear thermostat klick off although no one
touched it, and the burners shut off. Blower motor kick in,
and runs for few minutes, the it too, shuts off.
Then for the rest of the day, nothing will change.
Thermostat will click every few minutes calling for heat,
yet furnace will not respond. To correct this situation I have to
turn the thermostat off, and cut A/C power to the furnace,
wait few minutes, and turn everything back on, all may be well
for a day or two. Then back to the same ol’, same ol’.
I have checked the following to be good:
Induction motor, its switch, vent tube, exhaust flue,
Igniter, and flame sensor.
There are no loose connections. Filter is clean.
I assume something sends the furnace into "lock out" mode,
but what???