Pentair Thermal Fuse (White) | ETi Series Pool & Spa Heater | 475998 C4440 If the existing pool plumbing

If the existing pool plumbing cannot pull from the lower main drain

the switch closes and signals the control board to allow ignition to proceed

preventing unfiltered water bypass

and SP1085 model families

Pentair Thermal Fuse (White) | ETi Series Pool & Spa Heater | 475998 C4440 If the existing pool plumbingThe Pentair Thermal Fuse White (475998) is the OEM replacement thermal fuse for the Pentair ETi Series pool and spa heater line, including the ETi 250 and ETi 400 models. IMPORTANT: LICENSED PROFESSIONAL INSTALLATION REQUIRED Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high voltage components without proper certification. The thermal fuse is a one