BoilerFaultCodesIdeal 9.1.34 Fault Code
Also written as 9134 — same fault.
The Ideal 9.1.34 fault code means: your heat pump's engine has stopped running because it is struggling to start or has an electrical fault, meaning you have no heating or hot water.. It appears on 1 Ideal model in our database.
Technical description: Compressor Stall Error and Compressor Start Error and Compressor Terminals Short Circuit (L61) and Compressor Error
What causes the Ideal 9.1.34 fault?
This fault occurs when the heat pump's compressor, which is the heart of the system, is unable to begin its rotation or suffers an internal electrical short. It is often caused by a mechanical seizure within the unit or a failure in the electronic control board that provides the power to get it moving. Because the compressor cannot pump heat into your home, the system shuts down to prevent further electrical damage.
This fault can be more prevalent during the first cold snap of autumn when the system is required to work at higher pressures after being relatively idle over the summer.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the 9.1.34 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 9.1.34 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