BoilerFaultCodesIdeal F0 d Fault Code
Also written as F0D — same fault.
The Ideal F0 d fault code means: your boiler has detected that water is not moving through the system properly, which has caused it to stop working for safety.. It appears on 3 Ideal models in our database.
Technical description: No Water Flow
What causes the Ideal F0 d fault?
This fault occurs when the boiler's internal sensors detect that water isn't circulating through the unit quickly enough to carry heat away safely. The most common reasons include a failing internal pump, a physical blockage in the pipework, or air trapped within the system preventing the flow of water.
This issue is more frequent in autumn when heating systems are turned back on after a summer of inactivity, which can cause the internal pump to seize.
DIY fix possible
Check that your boiler pressure gauge is between 1 and 1.5 barEnsure all radiator valves are fully openVerify that the main stopcock and internal isolation valves are openTurn the power off and back on to reset the system
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the F0 d fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F0 d fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026