BoilerFaultCodesYour boiler has detected a communication problem or a electrical fault with the sensor that monitors water pressure, which has caused the system to stop working for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Pressure Sensor ‘Ranco’Black
What causes this fault?
This fault occurs when the boiler's main control board loses electrical contact with the sensor that monitors water pressure. The most common reason is a physical failure within the Ranco sensor itself or a loose connection in the wiring harness that links the sensor to the brain of the boiler.
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 E83486 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Powermax 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.