1017 W
FAULT CODE
Worcester Bosch
Low Water Pressure Warning (8000 Series)
Low Severity
DIY Check Possible
On Worcester Greenstar 8000 boilers, code 1017 W indicates the system water pressure is too low. The 'W' suffix means warning — the boiler may still operate but at reduced performance.
Step-by-Step Fix Guide
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Step 1
Top up the system using the filling loop until the pressure gauge reads 1.5 bar
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Step 2
Reset the boiler if it does not restart automatically
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Step 3
If pressure drops again within days, contact 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.