Heater frequently locks out and must be manually reset at the control panel.

Safety first: Do not repeatedly reset a heater without investigating the cause. Turn off power and gas before internal inspection.

Step-by-step checks:

• Record conditions: Note when lockouts occur (startup, mid-run, windy conditions, low pump speed). This helps pinpoint the cause.
• Clean flame sensor and check ground: Remove and clean the flame sensor. Ensure the burner and control board have a solid ground connection.
• Check flow switch: Wiggle the flow switch wiring and gently tap the body while the heater is running to see if it causes a trip (do this only if safe). Replace if intermittent.
• Stabilize gas supply: Have a gas technician verify that inlet and manifold pressures remain within Pahlen specs under all load conditions.

When to stop: If lockouts persist without a clear mechanical cause, a firmware update or control board replacement may be needed; contact Pahlen support or a service technician.