010
FAULT CODE
Navien
Abnormal Exhaust Temperature
High Severity
Engineer Required
The exhaust gas temperature is outside the normal range. The boiler has shut down as a safety precaution.
Step-by-Step Fix Guide
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Step 1
Allow the boiler to cool down
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Step 2
Check the external flue for blockages
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Step 3 Engineer only
A Gas Safe engineer should inspect the heat exchanger and exhaust sensor
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.