Bosch instant hot water systems can experience several standard operational issues over time, primarily tied to hard water scaling and environmental conditions. The most frequent problem is mineral buildup inside the heat exchanger, which restricts water flow, reduces thermal efficiency, and triggers lockout error codes if annual descaling is neglected. Other common issues include igniter wear, flame-sensing rod failure, blocked intake or exhaust flues, and erratic temperature behavior caused by fluctuating water pressure or clogged inlet filters.
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