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Update: I've followed the troubleshooting advice on the UM Error pages and swapped the connectors over between TEMP1 and TEMP3. The error then becomes a simple MAXTEMP displayed on the Ulticontroller, so from this I assume that the fault lies with the bed rather than the control board(s).
So I've stripped the bed down and checked the resistances across the various connections and terminals. Measured at the tails at the back of the connector block on the heated bed plate, the PT100 sensor is showing a steady 108.3 ohms at approx. 19C room temperature. The main heater track gives a reading of 3.2-3.3 ohms, but as that has been heating up OK I don't think there's a problem. Both of the sensor wires that run from the bed to the heater control board show very good continuity. The 3-pin cable running from the heater board to the main board also shows good continuity for all wires, even when I measure across pins on the boards sockets.
I'm running out of ideas here. Any ideas where the fault may lie?
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Update: I've followed the troubleshooting advice on the UM Error pages and swapped the connectors over between TEMP1 and TEMP3. The error then becomes a simple MAXTEMP displayed on the Ulticontroller, so from this I assume that the fault lies with the bed rather than the control board(s).
So I've stripped the bed down and checked the resistances across the various connections and terminals. Measured at the tails at the back of the connector block on the heated bed plate, the PT100 sensor is showing a steady 108.3 ohms at approx. 19C room temperature. The main heater track gives a reading of 3.2-3.3 ohms, but as that has been heating up OK I don't think there's a problem. Both of the sensor wires that run from the bed to the heater control board show very good continuity. The 3-pin cable running from the heater board to the main board also shows good continuity for all wires, even when I measure across pins on the boards sockets.
I'm running out of ideas here. Any ideas where the fault may lie?
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