Glowworm ultimate 60ff is not heating water?

Our glowworm ultimate 60ff is not heating our water. The central heating is working, but the domestic hot water is not getting hot enough. I removed and serviced the pump because the pump kept sticking, but since then although the heating is working the water is not heating up properly. The water only gets warm. Can anyone help please?

Macca

December 2010

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