Heating temperature limiter fault
The F14 error code on Saunier-Duval boilers indicates heating temperature limiter fault.
Saunier-Duval F14 means: heating temperature limiter fault. On this component the documented failure modes are the pump has failed — short circuit or open circuit or wiring, connector or harness of the pump damaged or loose. A Gas Safe registered engineer should diagnose the root cause.
What Does F14 Mean
The F14 code is shown by the boiler’s control board when it detects heating temperature limiter fault. The boiler then stops instead of continuing to run in that condition: the code is the appliance reporting a problem, not proof that the boiler is broken.
| What you see on the boiler |
|---|
| The display shows F14 and the boiler stops until the fault is cleared |
Common Causes
The manufacturer does not publish a cause list for this specific code. The causes below are the failure modes documented for the same component on other boilers, confirmed by the service literature of 8 different manufacturers.
| Cause |
|---|
| The pump has failed — short circuit or open circuit |
| Wiring, connector or harness of the pump damaged or loose |
Safety Warning
F14 is a gas-related fault. Never attempt to repair or adjust the gas valve, burner assembly, or flue system yourself. All gas work must be carried out by a Gas Safe registered engineer (UK) or licensed HVAC technician (US). Repeated resets after ignition failure can cause unburnt gas to accumulate inside the combustion chamber — this is a serious safety hazard. If you smell gas at any point, turn off the gas supply at the meter, open windows, leave the property, and call your gas emergency service immediately. Warning: this fault code may relate to gas supply, flue or combustion issues. Do not attempt repair — contact a Gas Safe registered engineer immediately.
Parts & Prices
Prices shown are indicative. Actual prices and availability vary by region.
Step-by-Step Diagnosis
F14 Central heating flow T° > 95°C (203 °F) System fault / Possible pump failure Check thermistor on flow F16 Flame detection fault (flame presence for more than 5 seconds after burner stopped) Gas valve defective F17 Power sup
How to Fix It
Reset the boiler after investigation
repair any loose connections or damaged wiring
replace the faulty component identified during diagnosis
if the fault persists after basic checks, contact a qualified heating engineer with the exact error code
Measure the resistance of the pump with a multimeter and compare it against the manufacturer’s resistance-versus-temperature table; replace it if it is open circuit, short circuit or out of range.
Unplug and re-seat the connector of the pump, then check the harness for chafing, corroded pins and breaks in continuity.
Refer to the Saunier-Duval service documentation for the detailed procedure. Only a qualified engineer should carry out these repairs.
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Affected Models
Saunier-Duval models that can display fault code F14:
| Model Family | Output Range | Frequency |
|---|---|---|
| All Saunier-Duval models | — | Possible |
Frequently Asked Questions
Reset the boiler after investigation. According to the technical documentation, this is the first check on the list for F14.
F14 is classified as a high-severity fault: it involves gas, combustion or flue components. Do not keep resetting the boiler and do not attempt the repair yourself — call a Gas Safe registered engineer.