Lochinvar Pilot Flame Instability / Draft Interference

Lochinvar water heater frequently goes out on pilot (standing pilot models) during windy conditions.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Improper vent termination, Downdrafts in chimney, Missing or damaged draft hood, Pilot flame too small

How to Fix / Troubleshooting

Safety: Turn gas control to OFF before working on venting or pilot assembly. Ensure adequate ventilation.

Steps:

  • 1. Inspect venting: Check that the vent cap is intact and properly installed. Replace missing or damaged caps.
  • 2. Verify draft hood: Ensure the draft hood is correctly seated on the heater and not blocked.
  • 3. Adjust/clean pilot: Clean the pilot orifice and adjust the pilot flame (if adjustable) to a strong, blue flame that envelops the thermocouple.
  • 4. Address building pressure: If exhaust fans or tight construction cause downdrafts, consult an HVAC professional to correct combustion air and venting issues.
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Repair Difficulty

Medium 3/5

Required Part

Pilot Assembly
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