BoilerFaultCodesYour boiler is unable to read the hot water temperature correctly, meaning you likely have no hot water or unstable water temperatures.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: DHW sensor open circuit. Check cable/connections not damaged. Renew DHW cable/sensor assy. Part No. 5106290
What causes this fault?
This fault occurs when the boiler's internal computer loses communication with the sensor responsible for measuring your tap water temperature. This is typically caused by the sensor's internal components failing due to age or the electrical wiring becoming brittle and snapping over time. Because the boiler no longer knows how hot the water is, it shuts down the hot water system as a safety precaution.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like E07 — no call-out fees, no surprises.
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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.
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