Prusa Error 13207: Heatbed MINTEMP, an Open Circuit
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Prusa error 13207 means the heatbed thermistor reported a temperature below its valid minimum. A genuinely cold bed reads room temperature, not below range, so this is almost always an open circuit: a disconnected plug or a broken core in the bed loom. Prusa’s text says to check the heatbed thermistor wiring, and that is exactly right.
Temperature sensor faults are unusually easy to diagnose because they fail in two directions and the direction is the clue. Open circuit reads at the bottom of the range and gives MINTEMP. Short circuit reads at the top and gives MAXTEMP.
Where to buy
Check in this order
- The connector, both ends. At the board and at the bed. Reseat firmly and look for a pin that has backed out of its housing.
- Flex the loom. With the printer on and showing the temperature, gently flex the bed cable along its length. A reading that jumps or appears locates the break for you.
- Look at cable ties. Ties pulled tight during a previous repair slowly cut through cores over months of movement — the same failure mode behind preheat errors.
- Measure the thermistor. Last. A 100 K NTC should read roughly 100 kΩ at room temperature. Open circuit means replace it.
Why it is rarely a cold bed
The minimum is set below any plausible room temperature precisely so that a genuinely cold printer does not trip it. If you are printing in an unheated space in deep winter you might see it once at startup, but it will clear as the room warms — and it will not come back mid-print, which a wiring fault will.
Related codes
13205 is the same sensor reading above range, which is a short rather than a break. 13201 is the bed failing to reach temperature, which is the heater rather than the sensor. Target temperatures by material are in bed temperature.
The same error reads 12207 on MINI, 31207 on CORE One, 35207 on CORE One L, 16207 on iX and 23207 on MK3.5.
Prusa Error 13207 FAQ
Is my bed too cold?
Almost certainly not. Below-range means the sensor is reading an open circuit. A cold bed reads room temperature and prints fine once heated.
MINTEMP or MAXTEMP — which is worse?
Neither is worse; they point at different faults. MINTEMP is a break in the circuit, MAXTEMP a short. Both are wiring rather than heat.
Can I test the thermistor without removing it?
Yes. Unplug it at the board and measure across the connector. Around 100 kΩ at room temperature is healthy; open circuit is not.
Why does it come and go?
An intermittent fault means a partial break or a loose pin rather than a failed sensor. Flexing the cable while watching the reading will find it.
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