What does the Viessmann 9C:5 to 9C:60 fault code mean?

Your boiler has identified a minor internal timing error, often related to the programming board or a sensor that is out of range.

How much does it cost to fix Viessmann error code 9C:5 to 9C:60?

Typical repair cost for the Viessmann 9C:5 to 9C:60 fault is £100-250 including labour.

Can I fix Viessmann fault code 9C:5 to 9C:60 myself?

Wait for the timer to count down and the code to disappear naturally

Viessmann 9C:5 to 9C:60 Fault Code: What It Means & How to Fix It

Technical description

Time adjustable from 5 to 60 minutes

What causes this fault?

This code appears when the boiler has been manually put into a specialized service mode, such as a chimney sweep test or a manual calibration check. It is triggered by a user or engineer adjusting the settings to run the burner at a specific output for a set duration. Once the programmed time for this test elapses, the boiler will automatically return to its normal heating operation.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

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Related fault codes

9CView →9FView →

Your boiler has identified a minor internal timing error, often related to the programming board or a sensor that is out of range.

Technical description

What causes this fault?

Engineer required

Related fault codes

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