Merge pull request #3477 from alephobjects/BedTempHysteresis

Implementation of M190 bed temp hysteresis
2.0.x
Scott Lahteine 9 years ago
commit a8e4d7c135

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 10 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -4399,14 +4399,14 @@ inline void gcode_M109() {
// Try to calculate a ballpark safe margin by halving EXTRUDE_MINTEMP
if (wants_to_cool && degTargetHotend(target_extruder) < (EXTRUDE_MINTEMP)/2) return;
#ifdef TEMP_RESIDENCY_TIME
#if TEMP_RESIDENCY_TIME > 0
millis_t residency_start_ms = 0;
// Loop until the temperature has stabilized
#define TEMP_CONDITIONS (!residency_start_ms || PENDING(now, residency_start_ms + (TEMP_RESIDENCY_TIME) * 1000UL))
#else
// Loop until the temperature is very close target
#define TEMP_CONDITIONS (wants_to_cool ? isCoolingHotend(target_extruder) : isHeatingHotend(target_extruder))
#endif //TEMP_RESIDENCY_TIME
#endif //TEMP_RESIDENCY_TIME > 0
cancel_heatup = false;
millis_t now, next_temp_ms = 0;
@ -4417,7 +4417,7 @@ inline void gcode_M109() {
#if HAS_TEMP_HOTEND || HAS_TEMP_BED
print_heaterstates();
#endif
#ifdef TEMP_RESIDENCY_TIME
#if TEMP_RESIDENCY_TIME > 0
SERIAL_PROTOCOLPGM(" W:");
if (residency_start_ms) {
long rem = (((TEMP_RESIDENCY_TIME) * 1000UL) - (now - residency_start_ms)) / 1000UL;
@ -4434,7 +4434,7 @@ inline void gcode_M109() {
idle();
refresh_cmd_timeout(); // to prevent stepper_inactive_time from running out
#ifdef TEMP_RESIDENCY_TIME
#if TEMP_RESIDENCY_TIME > 0
float temp_diff = fabs(degTargetHotend(target_extruder) - degHotend(target_extruder));
@ -4447,7 +4447,7 @@ inline void gcode_M109() {
residency_start_ms = millis();
}
#endif //TEMP_RESIDENCY_TIME
#endif //TEMP_RESIDENCY_TIME > 0
} while (!cancel_heatup && TEMP_CONDITIONS);
@ -4472,20 +4472,57 @@ inline void gcode_M109() {
// Exit if S<lower>, continue if S<higher>, R<lower>, or R<higher>
if (no_wait_for_cooling && wants_to_cool) return;
#if TEMP_BED_RESIDENCY_TIME > 0
millis_t residency_start_ms = 0;
// Loop until the temperature has stabilized
#define TEMP_BED_CONDITIONS (!residency_start_ms || PENDING(now, residency_start_ms + (TEMP_BED_RESIDENCY_TIME) * 1000UL))
#else
// Loop until the temperature is very close target
#define TEMP_BED_CONDITIONS (wants_to_cool ? isCoolingBed() : isHeatingBed())
#endif //TEMP_BED_RESIDENCY_TIME > 0
cancel_heatup = false;
millis_t next_temp_ms = 0;
millis_t now, next_temp_ms = 0;
// Wait for temperature to come close enough
do {
millis_t now = millis();
now = millis();
if (ELAPSED(now, next_temp_ms)) { //Print Temp Reading every 1 second while heating up.
next_temp_ms = now + 1000UL;
print_heaterstates();
SERIAL_EOL;
#if TEMP_BED_RESIDENCY_TIME > 0
SERIAL_PROTOCOLPGM(" W:");
if (residency_start_ms) {
long rem = (((TEMP_BED_RESIDENCY_TIME) * 1000UL) - (now - residency_start_ms)) / 1000UL;
SERIAL_PROTOCOLLN(rem);
}
else {
SERIAL_PROTOCOLLNPGM("?");
}
#else
SERIAL_EOL;
#endif
}
idle();
refresh_cmd_timeout(); // to prevent stepper_inactive_time from running out
} while (!cancel_heatup && (wants_to_cool ? isCoolingBed() : isHeatingBed()));
#if TEMP_BED_RESIDENCY_TIME > 0
float temp_diff = fabs(degBed() - degTargetBed());
if (!residency_start_ms) {
// Start the TEMP_BED_RESIDENCY_TIME timer when we reach target temp for the first time.
if (temp_diff < TEMP_BED_WINDOW) residency_start_ms = millis();
}
else if (temp_diff > TEMP_BED_HYSTERESIS) {
// Restart the timer whenever the temperature falls outside the hysteresis.
residency_start_ms = millis();
}
#endif //TEMP_BED_RESIDENCY_TIME > 0
} while (!cancel_heatup && TEMP_BED_CONDITIONS);
LCD_MESSAGEPGM(MSG_BED_DONE);
}

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 15 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 15 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -195,11 +195,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -199,11 +199,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
//#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -217,11 +217,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 3 // (seconds)
#define TEMP_HYSTERESIS 2 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -195,11 +195,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 5
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -198,11 +198,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -215,11 +215,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

@ -192,11 +192,16 @@
//#define TEMP_SENSOR_1_AS_REDUNDANT
#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
// Actual temperature must be close to target for this long before M109 returns success
// Extruder temperature must be close to target for this long before M109 returns success
#define TEMP_RESIDENCY_TIME 10 // (seconds)
#define TEMP_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// Bed temperature must be close to target for this long before M190 returns success
#define TEMP_BED_RESIDENCY_TIME 0 // (seconds)
#define TEMP_BED_HYSTERESIS 3 // (degC) range of +/- temperatures considered "close" to the target one
#define TEMP_BED_WINDOW 1 // (degC) Window around target to start the residency timer x degC early.
// The minimal temperature defines the temperature below which the heater will not be enabled It is used
// to check that the wiring to the thermistor is not broken.
// Otherwise this would lead to the heater being powered on all the time.

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