Ignition Failure
The most common Heatline fault code. The boiler has failed to ignite. Very commonly caused by a frozen condensate pipe in winter. F28 on Heatline boilers is equivalent to F28 on Vaillant boilers — they share the same code system.
F28 in winter on Heatline boilers is almost always a frozen condensate pipe. Thaw before resetting.
Step-by-Step Fix Guide
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Step 1
Check gas supply — try other gas appliances
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Step 2
In cold weather, check the condensate pipe for ice and thaw with warm water
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Step 3
Press the reset button (usually a flame icon)
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Step 4
If fault persists, call a Gas Safe engineer to check gas valve and ignition electrode
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.