GE Range Error Code ER 26

ER 26 on a GE range indicates a fault within the MTwisT control system, specifically that the relay supply voltage has been detected as too high while the relay is in its off state. The MTwisT control board manages power distribution to the range's heating elements and other components through a series of relays. Under normal conditions, when a relay is switched off, the voltage present at its supply line should fall within a defined acceptable range. When the control detects voltage that exceeds this threshold during the off state, it registers ER 26 as a protective fault to prevent damage to downstream components or unsafe operating conditions.

The root cause is typically an overvoltage condition at the relay supply circuit, which can originate from several points in the system. The incoming line voltage from the home's electrical supply may be running higher than the rated 240V for the appliance, which stresses the control board's internal power supply circuit. Alternatively, a failed or failing relay on the control board itself may not be switching fully open, allowing voltage to bleed through when it should be completely off. A defective MTwisT control board with damaged voltage regulation components can also produce this fault without any external voltage anomaly.

Because this fault involves relay supply voltage exceeding safe levels, it can indicate a condition where components are being subjected to elevated electrical stress. Proper diagnosis requires measuring the incoming line voltage at the terminal block and inspecting the control board for signs of heat damage or component failure. In many cases, a faulty control board is the primary source of this fault and will require replacement to resolve the error.