Customer Questions and Answers for High Limit Thermostat by Whirlpool

Hello Tony, Of course you should check the exhaust duct first since the temperature being held in the unit can cause the issue. Beyond this you should check the following in the following order: Gas available, igniter, radiant sensor, gas valve, hi-limit thermostat, regulating thermostat, temperature selector switch, timer, cycle selector switch, and the drive motor start switch. I know you already checked some of these in addition to changing some of these out. Obviously, the parts you have already changed are most likely not the issue. The others should have been checked in this order. One of these will be the issue. Let us know if we can assist you further.

Red, it sounds more like you're replacing the multi temp regulating thermostat WP3387134 located on the blower housing with four wires attached. The high limit switch WP303395 is located on the combustion/burner cone 33001312 and has only two wires attached to it. Hopefully this will help you determine the correct part needed and you can re-order the correct component. Thanks

Hello Dave, In this instance, I think I would replace the hi-limit thermostat WP303395 and the coil kit 279834. Check for loose connections and be extremely careful running the unit with the cabinet open as this changes the air flow through the unit and it will not cycle the thermostats the same as if the cabinet were closed.

Hello John. Yes, based on the information you provided, if you by pass the thermostat WP303395 and the flame works, you will need to replace the thermostat. Hope this helps.

Hello Andrew. You will need to test the thermostat WP303395 and the flame sensor WP338906 and make sure they are good. They should read closed for continuity. Also, check the igniter 4391996 and make sure it is getting hot enough to light the gas. If all of this is good, replace the coils 279834. Here is a link on how to use a multi-meter for the testing procedures. Hope this helps. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

Hello Jim. If you replaced the coils already, then the igniter could be the problem. If it is weak, the flame will ignite and then when it needs to reignite, the igniter does not get hot enough. If that is the case, you will need to replace the igniter 4391996. Hope this helps.

Hello Jim. Based on the information you provided, it sounds like the coils 279834 are bad and will need to be replaced. With the flame only lasting for a few seconds, the primary and secondary coils are opening and releasing the gas for ignition. Then when the unit goes to switch, the coils are failing. Hope this helps.

Hi Jim. It sounds like the venting system is clogged or kinked. You will need to check the vent and clean it out. Be sure and clean the vent pipe and the dryer air duct assembly. If the air flow is not good, the unit will retain moist air causing the clothes not to dry. Try running the unit with the vent unhooked from the back of the dryer and see if the dryer works properly. If your dryer is not heating , have you checked/ changed the flame senser part # WP338906. The high limit thermostat is part # WP338906. Thank you.

Hello Steve. Based on the information you provided, it sounds like you will need to replace the flame sensor WP338906 and the coils 279834. Check the coils 279834 and see if they test good. You can test the coils using a multi-meter MA-DM1. The two prong coil will read 1,000-1,300 ohms, and the three prong coil will read 1,300-1,400 ohms across prongs 1&2, and 500-600 ohms across prongs 1&3. Here is a link on how to use a multi-meter. Hope this helps. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html

Hello Gil. It sounds like the high limit thermostat WP303395 may be bad. Make sure the venting system is clear. If so, you will need to change the thermostat. Hope this helps.