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My Heater fires, but Main PCB shuts heater off after a short period of time. Lamp is flickering, and LED display shows “E1”, why is this happening? (ST-45-KFA-E / ST-70T-KFA-E / ST-125T-KFA-E ST-175T-KFA-E / ST-215T-KFA-E)

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1. Adjust Pump Pressure if it is incorrect
2. Dirty Input, Output or Lint Filter - Clean/replace Air Filter
3. If there is a dirty Fuel Filter, Clean or replace Fuel Filter
4. If the nozzle is Dirty, Clean or replace Nozzle
5. If the photocell lens is Dirty, Clean or replace Photocell
6. If the photocell is not installed properly, Adjust Photocell position
7. If the photocell is defective replace it
8. If there is an improper electrical connection between Main PCB and Photocell, Check wiring connections (See Wiring Diagrams on Page 7 in the manual)

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My Heater fires, but Main PCB shuts heater off after a short period of time. Lamp is flickering, and LED display shows “E1”, why is this happening? (ST-45-KFA-E / ST-70T-KFA-E / ST-125T-KFA-E ST-175T-KFA-E / ST-215T-KFA-E)