Calcium carbonate builds up in the kettle/boiler unit, gradually restricting water flow through the system.
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| On-off switch connector |
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| Light |
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| Wires leading from mains connection point and Earth point |
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| Connections on kettle/boiler unit. |
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| Connections on kettle/boiler unit. |
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| Pump engine. |
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| Wiring of kettle/boiler element |
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| Calcium carbonate cleared from kettle/boiler |
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| A weak formic acid solution helps breakdown the built up calcium carbonate. |
