Question about Honeywell Programmable Thermostat Heater

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Dy/night heater turns on for 10 sec then and off, over and over

Honeywell thermostat #CT3600A4444 9816

Day /night heater model #8ou-19

I called honeywell and the technician said it was not the thermostat, he thought it was the 'limit switch' in the heater. I unplugged the heater and plugged it back in and it still cycles on and off. We tried everything it said on the website.

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Hi and welcome to FixYa,

If I understand your concern, it is that the heater switches itself on for 10 seconds and then switches itself automatically off. A couple of ideas of you may want to explore/check:

  1. the built-in protection system detects an internal fault and to prevent any further damage switches itself off;
  2. the faults could be:
  • open heating element (assuming it is electrical);
  • blower not turning;
  • open limit switch. The limit switch is an inline cutoff to the heater that automatically opens up when the heater exceeds a pre-determined temperature independent of the settings in the thermostat. This is like a thermal fuse once gone bad will remain open;
  • whereas a thermostatic switch will turn on if temperature is below its threshold and turn off if the temperature is above. It is basically an on/off switch.
Often the limit switch would look like the image below.
Dy/night heater turns  on for 10 sec then and off, - 7d0829b.jpg
To be able to provide a more detailed information/assistance, pls verify & post back the model number of the Day Night Heater. Model 8ou-19 does not turn up anything. Or perhaps you can share the website you were referring to.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 21, 2008

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The components on the main circuit board needs to be checked as they gets heated and it turns off.so make it checked and replace the faulty.it will work.

Posted on Dec 16, 2008

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It is better to test and check the panel board, a malfunction on the switch causing ths problem

Posted on Dec 16, 2008

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