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Thanks for taking the time to reply. So I take it that you think using the chemical de-sludger will not be sufficient for my type of system?

Hello, I’m a first time poster so forgive me if this is repeated ground, or if I ask a stupid question. About a month ago my boiler (Glowworm Fuelsaver 35F) started ‘locking out’ after anywhere between 10mins and a few hours of turning on. The lock-out requires me to push a reset switch...