23 Apr 2009 5:27 PM:
The other button is the mains, it will reset the boiler, but if the boilers fault is an overheat fault it will only reset by pressing the red button, the faults on the heaters seem to be caused by too much gas been burnt for the amount of water going through, the gas should modulate down to compensate but seems not to, as the shower uses the least water this seems to cause the most problem
Community thread:
Water Heater
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