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12 Nov 2000 at 12:30 pm
#288722
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If the burner is firing AFTER the setpoint temperature is reached then turn off the fuel supply immediately and have a licensed professional check it for you!
Has there been any recent alteration done to the water supply piping? ie: water meter, check valve installed? Is there any reason for your incoming water supply to be greater than usual?
If the problem is a failed thermostat then have it rectified IMMEDIATELY!