A6
FAULT CODE
Viessmann
Low Gas Pressure
High Severity
Engineer Required
The boiler is detecting insufficient gas pressure to operate safely. The gas supply may be interrupted or restricted.
Step-by-Step Fix Guide
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Step 1
Check if other gas appliances in the home are working
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Step 2
If no gas appliances work, contact your gas supplier
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Step 3 Engineer only
If only the boiler is affected, a Gas Safe engineer should check the gas valve and meter
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.