Current situation put water on for a bath water was cold, checked pilot light on boiler was out, so followed instructions got it to light and again within 5 minits it went out tried to light again and soon as pulled finger of gas button after 20 seconds as by instruction light went out, Im getting a very small blue flame while holding gas button in. after reading up im thinking maybe my thermocouple could be the issue but just want some idea of what the fault is before i call someone