F1
FAULT CODE
Ideal
Low Water Pressure
Low Severity
DIY Check Possible
The boiler's water pressure has dropped below the minimum operating level. One of the most common and easily fixed Ideal faults.
Step-by-Step Fix Guide
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Step 1
Turn off the boiler at the programmer or thermostat
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Step 2
Locate the filling loop under the boiler
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Step 3
Open both filling loop valves slowly
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Step 4
Watch the pressure gauge and close the valves when it reaches 1.0–1.5 bar
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Step 5
Turn the boiler back on — it should restart automatically
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Step 6
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.