Dayton heater model 4e769b won't stay lit unless i hold the starter button. how can i check the temp probe?

If your Dayton heater model 4E769B won't stay lit without holding the starter button, it could indicate a faulty temperature probe or a problem with the safety mechanisms. To check the temperature probe, first, ensure the heater is unplugged. Then, locate the probe, usually near the burner assembly, and inspect it for any visible damage or corrosion. You can use a multimeter to measure its resistance; a functioning probe typically shows a resistance value that corresponds to the temperature it should be sensing. If the readings are out of range, consider replacing the probe.