Frozen Condensate / Flame Failure (Winter)
Baxi specifically flags E28 as associated with frozen condensate pipes in winter, making it distinct from E133. The boiler has lost its flame.
E28 on a Baxi boiler in winter almost certainly means a frozen condensate pipe. This is the most common winter fault across the Baxi range.
Step-by-Step Fix Guide
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Step 1
Locate the condensate pipe (white plastic pipe on outside wall)
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Step 2
Pour warm water along the entire exposed length
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Step 3
Listen for gurgling sounds indicating the blockage has cleared
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Step 4
Reset the boiler
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Step 5
If fault persists after thawing, call a Gas Safe engineer
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.