E15
Slant/Fin Excessive Lockouts / Retry Limit Exceeded

Boiler shows E15, intermittent lockouts, may coincide with multiple rapid restarts

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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

Repeated ignition failures, Unstable flame detection, Control board safety lockout on Slant/Fin boiler, Underlying gas or air supply issues

How to Fix / Troubleshooting

Safety: Do not repeatedly reset a locking-out boiler without finding the cause. Risk of raw gas accumulation.

Steps:

  • 1. Note prior errors: Many controls log the last fault before E15. Refer to the manual or on-screen history to identify the root cause (e.g., E01, E02).
  • 2. Address underlying issue: Follow troubleshooting for the preceding error code (ignition, flame, venting, etc.).
  • 3. Reset control: After correcting the fault, power down for 2–3 minutes, then restore power to clear the lockout.

Professional help: If E15 recurs, a technician should perform a full combustion and safety check to identify the underlying cause of repeated lockouts.

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Repair Difficulty

Hard 4/5

Required Part

Boiler Control Board
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