BoilerFaultCodesWhat the manual says
Manufacturer manualWater transducer – check system water pressure
What causes this fault?
This fault occurs when the boiler's internal sensor detects that there is not enough water pressure to operate safely. The most common reason is a slow leak somewhere in your central heating system or air being released from the radiators, which causes the pressure to drop below the required threshold. It can also be caused by the sensor itself becoming blocked with debris or failing electronically.
This issue often appears in autumn when the heating is turned on for the first time after summer, as natural pressure loss over several months becomes apparent.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like E041: no call-out fees, no surprise bills.
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