Check the water level in the boiler is the normal level. If the water level is low, water level, but if the water level is higher than the water level tube Kaew should be taken out, the water level at normal.
Check the water level in the boiler is normal. If the water level is low, add water to normal levels. But if the water level is above the glass. Water should be removed to normal water levels.
Check the water level in boiler normal levels. If the water level is low add water to normal levels. But if the water level higher than the glass tube. The normal water level should be taken to .