Questions & Answers for: Off The Wall bad gas

There's no gas coming into my ng wall heater. the valve is on, can it be the thermocuple valve is stuck closed? Or Thermocoupler is bad nd needs replaced,

...bad gas valve. A crack can allow the fan to blow the flame off of the thermocouple or flame sensor. A dirty pilot will cause the same effect. The bad limit switch could cycle the system and a bad gas ...

when gas wall heater lights a ball of flame comes not everytime..but once in a while when the gas wall heater ignites there is a ball of flame that comes out from the heater. the flame comes out of ...