Medium
LED 2: 1 on Ferroli Arena

Your boiler thinks a hot water tap is turned on even when all taps are closed, which may prevent your central heating from working.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

Hot water tap open - D.H.W. flowmeter (136) contact closed

From this model's manual
Verified against the Ferroli Boiler Optima 1001 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check all hot water taps in the house are fully closedEnsure there are no dripping taps or leaking hot water pipesTurn the boiler power off and back on again to reset the sensor

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Related fault codes

LED 1View →LED 3View →

All 80 fault codes on the Arena

Seeing a different code? Every code this model can display, in one place.

1012131415161718192021232425263031323435363738394041424345495051114A-4Display FlashingF2Green LED onLED 1 green (0)LED 1: 0LED 2 (C.H.)LED 2 (CH)LED 2 (D.H.W.)LED 2 (DHW)LED 2 yellow (0) [DHW mode]LED 2 yellow (1) [CH mode]LED 2: 0LED 3 (CH)LED 3 yellow (0) [CH mode]LED 3: 0LED 4 (C.H.)LED 4 (CH)LED 4 (D.H.W.)LED 4 (DHW)LED 4 green (0) [CH mode]LED 4 green (0) [DHW mode]LED 4: 0LED 4: 0 (Central Heating)LED 5 (CH)LED 5 (DHW)LED 5 red (1) [CH mode]LED 5 red (1) [DHW mode]LED 5: 1LED 5: 1 (Central Heating)LED 6 (C.H.)LED 6 (CH)LED 6 (D.H.W.)LED 6 (DHW)LED 6 yellow (0) [CH mode]LED 6 yellow (0) [DHW mode]LED 6: 0LED 6: 0 (Central Heating)LED 7 green (0)LED 7: 0LED 8 yellow (0)LED1 (green)LED2-5 (yellow)Orange LED onRadiators cold in winterRed LED on/Flashing

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