1. Smoke or strange smell on the first trial light up after installation
2. Sharp clicking noises at ignition, or when the unit cuts down or goes out
3. Steam is discharged from the outside vent
4. Pilot will not light
5. Pilot will not stay lit
6. Main burner won't light
7. Main burner won't stay lit
8. Room will not maintain temperature

You can also write to Info@ASAPHeat.com