H07
FAULT CODE
Worcester Bosch
Low Water Pressure Warning
Low Severity
DIY Check Possible
A low pressure warning code displayed on some Worcester Greenstar models. The boiler may continue to operate but is warning that pressure is approaching the minimum.
Step-by-Step Fix Guide
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Step 1
Top up the system to 1.5 bar using the filling loop
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Step 2
If pressure keeps dropping, call a Gas Safe engineer to check for leaks
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.