Low Mains Voltage High

Ideal Low Mains Voltage Fault Code

Also written as LOWMAINSVOLTAGE — same fault.

The Ideal Low Mains Voltage fault code means: your boiler has stopped working because the electricity supply coming into your home is not at a high enough voltage to power the internal components safely.. It appears on 12 Ideal models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Mains voltage too low
Typical repair cost £100-350 (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 Low Mains Voltage fault code

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

Source

Ideal Low Mains Voltage 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 31 August 2026