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This problem has been done to death on the forum.
It's a combination of a heat exchanger with very high resistance that struggles with a typical domestic type installation, mediocre boiler software (that was so sensitive it had to be revised), a heat exchanger design that's prone to blockage, and a failure of many installers to install it properly.
This problem has been done to death on the forum.
It's a combination of a heat exchanger with very high resistance that struggles with a typical domestic type installation, mediocre boiler software (that was so sensitive it had to be revised), a heat exchanger design that's prone to blockage, and a failure of many installers to install it properly.