9.1.6 High

Ideal 9.1.6 Fault Code

Also written as 916 — same fault.

The Ideal 9.1.6 fault code means: your heat pump has stopped providing hot water because a sensor that monitors the water temperature has developed a fault or is disconnected.. It appears on 1 Ideal model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: DHW Thermistor (T5) Error

What causes the Ideal 9.1.6 fault?

This fault occurs when the heat pump loses communication with the sensor monitoring the temperature inside your hot water cylinder. The most common reason is that the sensor has failed internally due to wear, or the wiring connecting it to the main control board has become loose or damaged.

Typical repair cost £140-£220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ideal models that show the 9.1.6 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ideal 9.1.6 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