Suburban ST-42 On Demand Water Heater Control Center
2 products
What does the Suburban ST-42 On Demand Water Heater Control Center do?
The ST-42 control center manages ignition, gas valve operation, and safety lockout for Suburban on-demand (tankless) RV water heaters. It handles the spark sequence, flame sensing, and fault diagnostics that keep the burner firing safely when there is a hot water demand. If your tankless unit will not light, cycles off mid-shower, or shows a fault code, the control board is one of the first parts to check after the gas supply and igniter.
Will the ST-42 board replace part numbers 161292 and 667003?
Yes. The Suburban ST-42 control center is the current service replacement for legacy part numbers 161292 and 667003, both of which were used on Suburban on-demand water heater models. Confirm the model and serial number on your water heater data plate before ordering so you get the correct ignition control for your specific unit.
How do I know if my STB control board has failed?
Common symptoms of a failed STB-style control board on a Suburban tankless heater include no spark at the igniter, repeated lockout after one or two ignition attempts, the burner lighting but cutting out, or no response at all when hot water is called for. Before swapping the board, verify LP pressure, 12V DC supply, the igniter electrode gap, and the flame sensor lead. If those check out, the control center is the likely failure point.
What else should I service while replacing the control center?
When you have the water heater opened up, it is worth inspecting the igniter electrode, flame sensor, gas valve solenoid, and inlet water filter screen. If your rig is heading into cold storage, also review our RV winterizing kits to protect the heat exchanger from freeze damage. Owners running a tank-style backup or second unit can browse our 10 gallon RV water heater parts for related service items.
Does this ship free, and how fast?
Orders over $100 ship free within the contiguous US. The ST-42 control center is a small, lightweight part and typically goes out within one business day. If you need help confirming fitment against your water heater model and serial number, text or call our team at 817-984-1852 before ordering.
