E 17 / E 19 High
Your boiler has detected that water is not moving through the system correctly, causing a temperature imbalance that has shut the unit down for safety.
Technical description: Maximum difference failure between 2 NTC temperature sensor – poor circulation.
Typical repair cost: £120-350 (including labour)
DIY fix possible
Check that your boiler pressure is between 1.0 and 1.5 bar on the gauge.Ensure all radiator valves and isolation valves under the boiler are fully open.Gently bleed your radiators to remove any trapped air pockets.Reset the boiler by pressing the 'R' or Reset button.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E 17 / E 19 — no call-out fees, no surprises.
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Parts commonly replaced
- Central heating pump
- NTC thermistor sensors
- Main heat exchanger (flushing/cleaning)
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