BoilerFaultCodesIdeal Pd Fault Code
Also written as PD — same fault.
The Ideal Pd fault code means: your boiler is stopping itself from working because the water temperature inside is getting too hot, similar to a car engine overheating.. It appears on 1 Ideal model in our database.
Technical description: Condensing Temperature High
What causes the Ideal Pd fault?
This fault occurs when the water temperature within the heat exchanger rises too quickly or exceeds safe limits, causing the boiler to shut down to prevent damage. The most common reason is a lack of water flow, often caused by a failing pump or a blockage in the system pipes that prevents heat from being carried away from the unit.
This fault is frequently seen at the start of autumn when heating systems are turned back on after a summer of inactivity, which can cause internal pump components to seize.
DIY fix possible
Check that all radiator valves are fully open to allow water to circulate.Ensure the external magnetic lime-scale filter (if fitted) is not blocked.Restart the boiler using the reset button to see if the fault clears.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the Pd fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Pd 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