What the manual says
Manufacturer manualThe water pressure in the heating system is too high.
Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
DIY fix possible
Locate a radiator in your home with a bleed valve.Use a radiator key to slightly open the valve and release some water into a container.Monitor the pressure gauge on your boiler until it drops to the recommended range of 1.0 to 1.5 bar.
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Related fault codes
All 172 fault codes on the Turbomax 242/282 1E
Seeing a different code? Every code this model can display, in one place.
Burner lock out indicatorF.000F.001F.002F.003F.010F.011F.012F.013F.020F.022F.023F.024F.025F.027F.028F.029F.032F.035F.040F.042F.044F.047F.049F.057F.061F.062F.063F.064F.065F.067F.068F.070F.071F.072F.074F.075F.076F.077F.078F.080F.081F.083F.084F.085F.087F.088F.089F.090F.092F.095F.096F.097F.105F.194F.195F.196F.317F.318F.320F.321F.322F.323F.324F.325F.326F.327F.330F.334F.336F.337F.338F.342F.343F.344F.347F.363F.707F.905Fan operation indicatorFlame indicatorHot water demand indicatorI.003I.020I.144Ignition indicatorL.016L.022L.025L.032L.095L.096L.097L.105L.144L.194L.195L.196L.319L.320L.322L.343N.013N.027N.032N.089N.095N.096N.097N.100N.144N.194N.270N.317N.319N.324N.343Power on indicatorS.000S.001S.002S.003S.004S.005S.006S.007S.008S.009S.010S.011S.012S.013S.014S.015S.016S.017S.019S.020S.021S.022S.023S.024S.025S.026S.027S.028S.029S.030S.031S.032S.034S.039S.042S.054S.057S.059S.088S.091S.092S.093S.096S.097S.098S.109S.175S.199S.326S.328S.335S.341S.599