Display shows SPFZ; heater runs pump for freeze protection but will not heat.

Information: SPFZ indicates the heater is protecting plumbing from freezing, not a combustion fault.

• Check ambient conditions: If the outdoor temperature is near or below freezing, this is normal. The heater may be locked out from heating to protect itself.
• Verify sensor: If SPFZ appears in warm weather, inspect the freeze sensor wiring and location. It should not be in direct contact with cold metal or evaporative cooling sources.
• Settings: Review the SmartPool installer menu (if accessible) for freeze protection setpoints and adjust only per the manual.