Your boiler is displaying the current temperature of the water returning from your radiators rather than indicating a specific fault.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Return temperature actual value
What causes this fault?
This is not a fault, but rather a status message triggered when the boiler is actively monitoring the temperature of the water coming back from your radiators. It occurs during normal operation to help the boiler's internal computer calculate how much heat is needed to keep your home comfortable. You do not need to take any action as your heating and hot water will continue to work as normal.
DIY fix possible
No action required as this is an informative status code, not an error.Press the 'i' or 'back' button to clear the status from the display.Monitor the boiler to ensure it continues to provide heating and hot water as normal.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like D.41 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.