How much does it cost to fix Grant error code OUTDR?

Typical repair cost for the Grant OUTDR fault is £90-180 including labour.

OUTDR Low

Grant OUTDR Fault Code

Q: What does the Grant OUTDR fault code mean?

Your boiler has lost connection with its outside temperature sensor, which means the heating might not adjust correctly to the weather.

The Grant OUTDR fault code means: your boiler has lost connection with its outside temperature sensor, which means the heating might not adjust correctly to the weather.. It appears on 2 Grant models in our database.

Technical description: Outdoor sensor short / Outdoor sensor open

What causes the Grant OUTDR fault?

This fault occurs when the electrical signal between the boiler and the external sensor is broken or distorted. The most common reason is water ingress or corrosion inside the sensor housing on the outside wall, or damage to the cable caused by gardening accidents or pests.

This fault is more common during autumn and winter when heavy rain or freezing temperatures can expose weaknesses in the sensor's weatherproofing.

Typical repair cost £90-180 (including labour)

Engineer required

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

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Grant models that show the OUTDR fault code

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

Source

Grant OUTDR fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026