OVERHEATING AND PREMATURE DETERIORATION OF THE COMBUSTION CHAMBER CAN OCCUR IN MARGINAL OR POOR INSTALLATIONS OF THE FURNACE. THE DETERIORATION IS CAUSED WHEN AIR CIRCULATION FROM THE FURNACE HOUSING IS RESTRICTED EITHER BY A LACK OF RETURN AIR CIRCULATION OR A DUCTING SYSTEM WHICH PREVENTS FREE CIRCULATION OF THE HEATED AIR FROM THE FURNACE.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.
CONTAMINANTS COULD BLOCK THE INTERNAL ORIFICES IN THE ITT VALVES, CAUSING THE GAS CONTROL VALVE TO FAIL IN OPEN POSITION; THIS WOULD ALLOW UNBURNED GAS TO REACH VEHICLE'S LIVING QUARTERS.