BoilerFaultCodesYour boiler has detected that the electrical wiring coming into the unit is connected incorrectly, meaning the live and neutral wires are swapped.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: PHASE REVERSAL ERROR
What causes this fault?
This fault occurs when the electrical supply to the boiler has been wired with the live and neutral connections swapped. It most commonly happens following recent electrical work in the home or if a new plug or fused spur has been installed incorrectly. The boiler's safety sensors detect this 'reversed polarity' and shut the system down as a precaution to prevent damage to the internal electronics.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like H......n........ — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Mexico HE is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.