What does the Johnson Starley LOW POWER SUPPLY FROM MAINS fault code mean?

Your boiler is not receiving the correct amount of electricity from your home's power supply to run safely and has shut down as a precaution.

Johnson Starley LOW POWER SUPPLY FROM MAINS Fault Code: What It Means & How to Fix It

Typical repair cost for the Johnson Starley LOW POWER SUPPLY FROM MAINS fault is £180-450 including labour.

Check if mains supply to heater is between 190V - 256V @ 50 Hz, check for electrical fault, or replace PCB

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Work through these before the call-out.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.