99
Noritz
Flame Detection Failure / Safety Lockout
Error code 99 displayed; unit shuts down and will not operate.
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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, Faulty flame rod, Gas supply interruption, PCB safety lockout after multiple errors
How to Fix / Troubleshooting
Safety first: Turn OFF power and gas. If you smell gas, evacuate and contact your gas supplier.
Steps to check and correct:
- Resolve underlying ignition issues: Follow troubleshooting for errors 11, 12, and 72 (ignition and flame sensing).
- Power reset: After addressing causes, turn off power at the breaker for 10 minutes to clear lockout, then restore.
- Test operation: Run hot water and observe. If error 99 returns, do not continue resetting; contact a Noritz-authorized technician to inspect gas and ignition systems.
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Repair Difficulty
Professional Required
5/5
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