BoilerFaultCodesWhat the manual says
Manufacturer manualReturn temperature actual value
What causes this fault?
This is not actually a fault, but rather a status message indicating that the boiler is currently measuring and displaying the temperature of the water coming back from your radiators. It occurs during normal operation when the control system or an engineer has requested to see the live return temperature data on the screen. Your boiler will continue to provide heating and hot water as normal while this code is visible.
DIY fix possible
Check if the display returns to the normal pressure or temperature reading after a few minutesPress the 'i' button to exit the information menu if you have accidentally entered itNo further action is required if the boiler is heating your home correctly
Avoid the next call-out bill
A cover plan would handle faults like D.41: no call-out fees, no surprise bills.
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Related fault codes
All 135 fault codes on the ecoTEC pro 28
Seeing a different code? Every code this model can display, in one place.