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Lock out light on Heatslave 20/25?

Have pressed reset button at top, light stays on. Ref. has been made to a second 'reset' button below expansion chamber behind a silver plate 10" sq. My plate is riveted! Any clues as to location of this second 'reset' button?

John
November 2015
Heating, Home Heating SystemsLight Reset Button Second

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Mend Heating, Home Heating Systems

Worcester boiler dripping water?

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Mend Home Heating Systems
Mend Heating, Home Heating Systems
Free repair help for home heating systems