HOW TO FIX ERROR CODE 90 ON A NORITZ
- danielqualityplumb
- May 23
- 1 min read
Updated: May 24
A code 90 indicates a combustion abnormality caused by an improper mixture of air and fuel. Possible culprits are insufficient gas supply, a blockage in the fuel vent or debris in the fan motor.
You will need a licensed contractor to resolve this error. He or she will check gas pressures, venting length, dip switches, etc.
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