What the manual says
Manufacturer manualNo gas at gas valve, incorrect gas supply, blocked flue, blocked condensate trap, damaged probe, or faulty PCB
From this model's manual
Verified against the Potterton/Potterton Bm Potterton Promax Sl Installation Guide 2016 Pdf installation & service manual.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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All 6 fault codes on the Promax SL 24 Heat ErP
Seeing a different code? Every code this model can display, in one place.