I have a trane xb 90 the led light is flashing 5 times. I have already replaced the inducer fan, the main board, and the roll out switch. It still will not blow warm air. Any help would be great. It is getting very cold in my house for my family.

Why did you replace all the parts? It is unlikely they were all bad. Start with basics -what happens when thermostat calls for heat? What is the 5 blink code? Should be on the inside of the front panel.Does ignitor light? Is it very bright?-should be a yellow heat. Have you cleaned or replaced the flame sensor? Reset all limit switched? -pushed the red buttons? Tested the high limit sensor? -usually a small black square item with 2 wires, located on main plenum.

The 5 blink code says it's the roll out sensor. I replaced the board because after a hvac tech. came over we followed allt he lines and after unpluging the wire harness and pluging it back in the ignitor worked two times ran a full cycle and then stopped again. I figured the board was going. The first board was flashing six times and that meens a bad ground. Which was not the case. Now the new one flashes 5 times and I replaced the roll out switch cause that's what it indicated. Still no heat. Everything else is working fine.

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Originally Posted by Tilson

The 5 blink code says it's the roll out sensor. I replaced the board because after a hvac tech. came over we followed allt he lines and after unpluging the wire harness and pluging it back in the ignitor worked two times ran a full cycle and then stopped again. I figured the board was going. The first board was flashing six times and that meens a bad ground. Which was not the case. Now the new one flashes 5 times and I replaced the roll out switch cause that's what it indicated. Still no heat. Everything else is working fine.

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So the inducer fan comes on? Does ignitor try to light? Rollout switch problem is usually post ignition. Make sure the pressure sensor is OK and I would also test the high limit sensor.