28
FAULT CODE
Ravenheat
Low Water Pressure / Pump Fault (CSI)
Low Severity
DIY Check Possible
On Ravenheat CSI 120 boilers, code 28 indicates a failed low water pressure switch or pump fault. May indicate incorrect system pressure or a failed pressure switch.
Step-by-Step Fix Guide
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Step 1
Check system pressure and repressurise to 1.5 bar if low
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Step 2
Reset the boiler
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Step 3
If fault persists, call a Gas Safe engineer to test the pressure switch and pump
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.