I have a GB142 working with both space heating and heating a DHW storage tank. Recently the DHW side has stopped working. At first I suspected a bad temp sensor. Then I noticed that when I turned the DHW temp control knob on the GB142 back and forth, I can hear a relay clicking. The LED under the knob does not light. This makes me think that the sensor is ok and the problem is deeper in the GB142. Any ideas?
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