E.01 – .12 High
Your boiler has stopped working because it believes the water returning to the unit is hotter than the water leaving it, which usually indicates a circulation problem or a sensor error.
Technical description: Requires reset – temperature measured by return sensor greater than flow temperature.
Typical repair cost: £90-180 (including labour)
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 bar on the gaugePress and hold the 'R' or Reset button for five seconds
Protect yourself from future repair bills
A boiler cover plan would cover faults like E.01 – .12 — no call-out fees, no surprises.
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Parts commonly replaced
- NTC Return Sensor
- NTC Flow Sensor
- Internal Pump
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