Navien Water Heater Error Code 032: How to Fix It
Medium 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 032
- Brand
- Navien
- Product Type
- water_heater
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Multimeter
- Screwdriver set
- Replacement flue gas thermistor (if needed)
How to Fix Error Code 032
-
Turn Off Power and Gas
Always disconnect power and gas before servicing the unit. -
Locate the Flue Gas Thermistor
-
Inspect the Wiring and Connector
-
Test the Thermistor with a Multimeter
-
Replace the Thermistor if Faulty
Use only a genuine Navien replacement part to ensure correct operation. -
Check the Control Board
Control board replacement should be done by a qualified professional. -
Restore Power and Test
Parts You May Need
Flue gas thermistor
Check Price on Amazon
Flue gas thermistor
Check Price on Amazon
Flue gas thermistor
Check Price on Amazon
Flue gas thermistor
Check Price on Amazon
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When to Call a Professional
If you have tested the thermistor and it is good, but the error persists, the control board may be faulty. Professional diagnosis is recommended for control board or internal wiring issues.Frequently Asked Questions
What does Navien error 032 mean?
Navien error 032 indicates an open flue gas thermistor. This means the exhaust temperature sensor circuit is broken, preventing the heater from operating safely.
Can I use a generic thermistor for my Navien?
No, always use a genuine Navien replacement thermistor to ensure proper fit and correct resistance values. Using a generic part may cause further issues or safety hazards.
Will a power reset fix error 032?
A power reset may temporarily clear the error if it was caused by a loose connection or electrical glitch, but if the thermistor is truly open, the error will return.
How much does it cost to fix Navien error 032?
If you DIY, a thermistor costs around $20-50. A service call from a technician typically costs $100-200, plus parts and labor.
Is it safe to operate my water heater with error 032?
No. Error 032 disables the heater to prevent unsafe operation due to faulty temperature sensing. Attempting to bypass the error could cause fire or carbon monoxide exposure.