How much does it cost to fix Ideal error code LED 1 fast pulse?

Typical repair cost for the Ideal LED 1 fast pulse fault is £90-180 including labour.

LED 1 fast pulse Low

Ideal LED 1 fast pulse Fault Code

Q: What does the Ideal LED 1 fast pulse fault code mean?

Your boiler has detected a minor electronic sensor issue and is running at a lower power level to keep your home warm until it can be serviced.

Also written as LED1FASTPULSE — same fault.

The Ideal LED 1 fast pulse fault code means: your boiler has detected a minor electronic sensor issue and is running at a lower power level to keep your home warm until it can be serviced.. It appears on 6 Ideal models in our database.

Technical description: The boiler will continue to operate with a reduced performance in some fault conditions.

What causes the Ideal LED 1 fast pulse fault?

This fault occurs when one of the internal temperature sensors sends an inconsistent signal to the main control board, suggesting the sensor is starting to fail or has a poor electrical connection. Instead of shutting down completely, the boiler enters a safety mode to prevent overheating while still providing basic heating. The root cause is typically wear and tear on the thermistor component or moisture affecting the wiring harness.

Typical repair cost £90-180 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ideal models that show the LED 1 fast pulse fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ideal LED 1 fast pulse fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026