L11
FAULT CODE
Ideal
Central Heating Thermistor Fault
Medium Severity
Engineer Required
The central heating NTC thermistor is reading outside its normal range. The sensor may have developed a fault.
Step-by-Step Fix Guide
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Step 1
A Gas Safe engineer will test the thermistor with a multimeter
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Step 2
The sensor or wiring harness may need replacing
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Step 3 Engineer only
This is typically a quick and inexpensive repair
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.