Chris M and Kathy came out due to no heat issues with boiler. Performed diagnostic. Found boiler water temperature at 100 degrees and all 3 zones calling for heat. Found pilot was lit but main burners not coming on. Found aquastat controller having intermittent issues with sending proper voltage to gas valve. After messing with the aquastat controller found boiler to try and fire. Snuffed out the pilot flame and the gas valve was still trying to pour gas through main burner tubes. This is a sign the gas valve and thermocouple are also failing. Checked expansion tank and rest of safeties on boiler. Found all safeties are functioning as should. Providing customer with estimate on repairs. Got permission to perform work. Went to supply house and picked up parts. Came back with correct components. Shut gas down. Took apart entire gas line. Took apart gas valve. Took apart pilot tube and thermocouple. Replaced with new gas valve. Replaced pilot tubing with new. Replaced thermocouple with ne