GSW power vent water heater displays E011 and the blower runs continuously without firing

Safety: Turn off power and gas. Do not operate the heater with a suspected venting fault.

• Inspect pressure switch: Locate the round pressure switch near the blower. Disconnect the tubing and wiring. Gently tap the switch body to free a stuck diaphragm.
• Check tubing and vent for water: Remove the tubing and check for water. Drain any condensate from low spots in the vent and correct vent slope to ensure proper drainage.
• Test switch continuity (advanced): With no call for heat and no blower running, the switch should be open. If it reads closed, replace the pressure switch with a GSW-approved part.
• Wiring inspection: Look for shorted or crossed wires between the pressure switch and control board. Repair as needed.
• Control board: If a new switch behaves the same and wiring is correct, the control board may be misreading the signal and should be replaced by a technician.