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Check all the grounding connections at the grounding buss. My electric in-wall oven kept blowing control boards. The ground was loose. The clock and display worked until more power was needed for cooking then the weak ground killed everything.That may not be your problem but it is still a good item to check on an older service.
Back at the wires coming into the house yes right where they enter, check them for damage, corrosion. Or on the main panel, check the wires. there may be a damaged wire.Something may be causing a restriction in the current prior to the breaker box..
Some quick test results using a small fan space heater. Should the voltage be dropping so much under load?Bathroom Outlet:Off - 122.8V, 0AFan only - 122.2V, .2A, Low Heat - 112.4V, 7.8AHigh Heat - 108.5V, 11.2AKitchen Outlet:Off - 123.4V, 0AFan Only - 123.3V, .2ALow Heat - 118V 8.2AHigh Heat - 116.2V 11.9ABedroom:Off - 120.8V, 0AFan - 120.7V, .2ALow Heat - 114.6V, 8.0AHigh Heat - 112.7V, 11.7A
With the space heater on high heat the Kill A Watt meter shows that 11 amps is being drawn by the space heater.With the Kill A Watt meter plugged into the bathroom outlet, I turned the toaster oven on and the voltage on the bathroom outlet went up to 126V. Is this normal?