108
FAULT CODE
Ariston
Insufficient Water — Refill Required
Low Severity
DIY Check Possible
On Ariston combi boilers, code 108 indicates the system has insufficient water and needs to be repressurised.
Step-by-Step Fix Guide
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Step 1
Locate the filling loop and slowly open the valves until pressure reaches 1.0–1.5 bar
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Step 2
Close the filling loop
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Step 3
Reset the boiler
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Step 4
If pressure drops frequently, 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.