BoilerFaultCodesIdeal 9.1.31 Fault Code
Also written as 9131 — same fault.
The Ideal 9.1.31 fault code means: your heat pump has stopped because the refrigerant gas is getting too hot, likely due to a blockage or restricted water flow through the system.. It appears on 1 Ideal model in our database.
Technical description: Condensing Temperature High Error
What causes the Ideal 9.1.31 fault?
This fault occurs when the refrigerant gas inside the unit reaches a dangerously high temperature, causing the system to shut down for safety. The most common reason is that heat isn't being moved away from the unit fast enough, often due to a blockage in the pipes, a failing pump, or a build-up of sludge in the system filter.
DIY fix possible
Check that all your radiators are turned on and the valves are open.Ensure the external unit is clear of leaves, debris, or snow.Try resetting the unit at the control panel to see if the fault clears.
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Gas Safe Register →Ideal models that show the 9.1.31 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 9.1.31 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